diff options
| -rw-r--r-- | ChangeLog | 52 | ||||
| -rw-r--r-- | hurd/Makefile | 1 | ||||
| -rw-r--r-- | hurd/Versions | 9 | ||||
| -rw-r--r-- | hurd/hurdlock.c | 215 | ||||
| -rw-r--r-- | hurd/hurdlock.h | 125 | ||||
| -rw-r--r-- | hurd/hurdpid.c | 3 | ||||
| -rw-r--r-- | hurd/hurdsig.c | 4 | ||||
| -rw-r--r-- | hurd/setauth.c | 5 | ||||
| -rw-r--r-- | mach/Makefile | 2 | ||||
| -rw-r--r-- | mach/lock-intern.h | 69 | ||||
| -rw-r--r-- | mach/lowlevellock.h | 81 | ||||
| -rw-r--r-- | mach/mutex-init.c | 7 | ||||
| -rw-r--r-- | manual/errno.texi | 10 | ||||
| -rw-r--r-- | sysdeps/mach/Makefile | 26 | ||||
| -rw-r--r-- | sysdeps/mach/hurd/bits/errno.h | 6 | ||||
| -rw-r--r-- | sysdeps/mach/hurd/cthreads.c | 10 | ||||
| -rw-r--r-- | sysdeps/mach/hurd/libc-lock.h | 216 | ||||
| -rw-r--r-- | sysdeps/mach/hurd/setpgid.c | 10 | ||||
| -rw-r--r-- | sysdeps/mach/hurd/setsid.c | 10 | ||||
| -rw-r--r-- | sysdeps/mach/libc-lock.h | 142 |
20 files changed, 689 insertions, 314 deletions
diff --git a/ChangeLog b/ChangeLog index 36430d6169..af84374b68 100644 --- a/ChangeLog +++ b/ChangeLog @@ -6,6 +6,58 @@ __libc_cleanup_end): Rewrite implementation using __attribute__ ((__cleanup__)). (__libc_cleanup_push, __libc_cleanup_pop): New macros. + * hurd/Makefile (routines): Add hurdlock. + * hurd/Versions (GLIBC_PRIVATE): Added new entry to export the above + interface. + (HURD_CTHREADS_0.3): Remove __libc_getspecific. + * hurd/hurdpid.c: Include <lowlevellock.h> + (_S_msg_proc_newids): Use lll_wait to synchronize. + * hurd/hurdsig.c: (reauth_proc): Use __mutex_lock and __mutex_unlock. + * hurd/setauth.c: Include <hurdlock.h>, use integer for synchronization. + * mach/Makefile (lock-headers): Remove machine-lock.h. + * mach/lock-intern.h: Include <lowlevellock.h> instead of + <machine-lock.h>. + (__spin_lock_t): New type. + (__SPIN_LOCK_INITIALIZER): New macro. + (__spin_lock, __spin_unlock, __spin_try_lock, __spin_lock_locked, + __mutex_init, __mutex_lock_solid, __mutex_unlock_solid, __mutex_lock, + __mutex_unlock, __mutex_trylock): Use lll to implement locks. + * mach/mutex-init.c: Include <lowlevellock.h> instead of <cthreads.h>. + (__mutex_init): Initialize with lll. + * manual/errno.texi (EOWNERDEAD, ENOTRECOVERABLE): New errno values. + * sysdeps/mach/Makefile: Add libmachuser as dependencies for libs + needing lll. + * sysdeps/mach/hurd/bits/errno.h: Regenerate. + * sysdeps/mach/hurd/cthreads.c (__libc_getspecific): Remove function. + * sysdeps/mach/hurd/bits/libc-lock.h: Remove file. + * sysdeps/mach/hurd/setpgid.c: Include <lowlevellock.h>. + (__setpgid): Use lll for synchronization. + * sysdeps/mach/hurd/setsid.c: Likewise with __setsid. + * sysdeps/mach/bits/libc-lock.h: Include <tls.h> and <lowlevellock.h> + instead of <cthreads.h>. + (_IO_lock_inexpensive): New macro + (__libc_lock_recursive_t, __rtld_lock_recursive_t): New structures. + (__libc_lock_self0): New declaration. + (__libc_lock_owner_self): New macro. + (__libc_key_t): Remove type. + (_LIBC_LOCK_INITIALIZER): New macro. + (__libc_lock_define_initialized, __libc_lock_init, __libc_lock_fini, + __libc_lock_fini_recursive, __rtld_lock_fini_recursive, + __libc_lock_lock, __libc_lock_trylock, __libc_lock_unlock, + __libc_lock_define_initialized_recursive, + __rtld_lock_define_initialized_recursive, + __libc_lock_init_recursive, __libc_lock_trylock_recursive, + __libc_lock_lock_recursive, __libc_lock_unlock_recursive, + __rtld_lock_initialize, __rtld_lock_trylock_recursive, + __rtld_lock_lock_recursive, __rtld_lock_unlock_recursive + __libc_once_define, __libc_mutex_unlock): Reimplement with lll. + (__libc_lock_define_recursive, __rtld_lock_define_recursive, + _LIBC_LOCK_RECURSIVE_INITIALIZER, _RTLD_LOCK_RECURSIVE_INITIALIZER): + New macros. + Include <libc-lockP.h> to reimplement libc_key* with pthread_key*. + * hurd/hurdlock.c: New file. + * hurd/hurdlock.h: New file. + * mach/lowlevellock.h: New file 2018-03-18 Samuel Thibault <samuel.thibault@ens-lyon.org> diff --git a/hurd/Makefile b/hurd/Makefile index 2b318c9ca0..7a787d2900 100644 --- a/hurd/Makefile +++ b/hurd/Makefile @@ -54,6 +54,7 @@ routines = hurdstartup hurdinit \ vpprintf \ ports-get ports-set hurdports hurdmsg \ errno-loc \ + hurdlock \ $(sig) $(dtable) $(inlines) port-cleanup report-wait xattr sig = hurdsig hurdfault siginfo hurd-raise preempt-sig \ trampoline longjmp-ts catch-exc exc2signal hurdkill sigunwind \ diff --git a/hurd/Versions b/hurd/Versions index 602391ca08..af6a0e45de 100644 --- a/hurd/Versions +++ b/hurd/Versions @@ -147,6 +147,13 @@ libc { # cthreads functions with stubs in libc __cthread_keycreate; __cthread_getspecific; __cthread_setspecific; - __libc_getspecific; + } + + GLIBC_PRIVATE { + # Used by other libs. + __lll_abstimed_wait; __lll_abstimed_xwait; + __lll_abstimed_lock; __lll_robust_lock; + __lll_robust_abstimed_lock; __lll_robust_trylock; + __lll_robust_unlock; } } diff --git a/hurd/hurdlock.c b/hurd/hurdlock.c new file mode 100644 index 0000000000..c06b03cf30 --- /dev/null +++ b/hurd/hurdlock.c @@ -0,0 +1,215 @@ +/* Hurd helpers for lowlevellocks. + Copyright (C) 1999-2017 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <http://www.gnu.org/licenses/>. */ + +#include "hurdlock.h" +#include <hurd.h> +#include <hurd/hurd.h> +#include <time.h> +#include <errno.h> +#include <unistd.h> + +/* Convert an absolute timeout in nanoseconds to a relative + timeout in milliseconds. */ +static inline int __attribute__ ((gnu_inline)) +compute_reltime (const struct timespec *abstime, clockid_t clk) +{ + struct timespec ts; + __clock_gettime (clk, &ts); + + ts.tv_sec = abstime->tv_sec - ts.tv_sec; + ts.tv_nsec = abstime->tv_nsec - ts.tv_nsec; + + if (ts.tv_nsec < 0) + { + --ts.tv_sec; + ts.tv_nsec += 1000000000; + } + + return (ts.tv_sec < 0 ? -1 : + (int)(ts.tv_sec * 1000 + ts.tv_nsec / 1000000)); +} + +int __lll_abstimed_wait (void *ptr, int val, + const struct timespec *tsp, int flags, int clk) +{ + int mlsec = compute_reltime (tsp, clk); + return (mlsec < 0 ? KERN_TIMEDOUT : + lll_timed_wait (ptr, val, mlsec, flags)); +} + +int __lll_abstimed_xwait (void *ptr, int lo, int hi, + const struct timespec *tsp, int flags, int clk) +{ + int mlsec = compute_reltime (tsp, clk); + return (mlsec < 0 ? KERN_TIMEDOUT : + lll_timed_xwait (ptr, lo, hi, mlsec, flags)); +} + +int __lll_abstimed_lock (void *ptr, + const struct timespec *tsp, int flags, int clk) +{ + if (lll_trylock (ptr) == 0) + return (0); + + while (1) + { + if (atomic_exchange_acq ((int *)ptr, 2) == 0) + return (0); + else if (tsp->tv_nsec < 0 || tsp->tv_nsec >= 1000000000) + return (EINVAL); + + int mlsec = compute_reltime (tsp, clk); + if (mlsec < 0 || lll_timed_wait (ptr, + 2, mlsec, flags) == KERN_TIMEDOUT) + return (ETIMEDOUT); + } +} + +/* Robust locks. */ + +/* Test if a given process id is still valid. */ +static inline int valid_pid (int pid) +{ + task_t task = __pid2task (pid); + if (task == MACH_PORT_NULL) + return (0); + + __mach_port_deallocate (__mach_task_self (), task); + return (1); +} + +/* Robust locks have currently no support from the kernel; they + are simply implemented with periodic polling. When sleeping, the + maximum blocking time is determined by this constant. */ +#define MAX_WAIT_TIME 1500 + +int __lll_robust_lock (void *ptr, int flags) +{ + int *iptr = (int *)ptr; + int id = __getpid (); + int wait_time = 25; + unsigned int val; + + /* Try to set the lock word to our PID if it's clear. Otherwise, + mark it as having waiters. */ + while (1) + { + val = *iptr; + if (!val && atomic_compare_and_exchange_bool_acq (iptr, id, 0) == 0) + return (0); + else if (atomic_compare_and_exchange_bool_acq (iptr, + val | LLL_WAITERS, val) == 0) + break; + } + + for (id |= LLL_WAITERS ; ; ) + { + val = *iptr; + if (!val && atomic_compare_and_exchange_bool_acq (iptr, id, 0) == 0) + return (0); + else if (val && !valid_pid (val & LLL_OWNER_MASK)) + { + if (atomic_compare_and_exchange_bool_acq (iptr, id, val) == 0) + return (EOWNERDEAD); + } + else + { + lll_timed_wait (iptr, val, wait_time, flags); + if (wait_time < MAX_WAIT_TIME) + wait_time <<= 1; + } + } +} + +int __lll_robust_abstimed_lock (void *ptr, + const struct timespec *tsp, int flags, int clk) +{ + int *iptr = (int *)ptr; + int id = __getpid (); + int wait_time = 25; + unsigned int val; + + while (1) + { + val = *iptr; + if (!val && atomic_compare_and_exchange_bool_acq (iptr, id, 0) == 0) + return (0); + else if (atomic_compare_and_exchange_bool_acq (iptr, + val | LLL_WAITERS, val) == 0) + break; + } + + for (id |= LLL_WAITERS ; ; ) + { + val = *iptr; + if (!val && atomic_compare_and_exchange_bool_acq (iptr, id, 0) == 0) + return (0); + else if (val && !valid_pid (val & LLL_OWNER_MASK)) + { + if (atomic_compare_and_exchange_bool_acq (iptr, id, val) == 0) + return (EOWNERDEAD); + } + else + { + int mlsec = compute_reltime (tsp, clk); + if (mlsec < 0) + return (ETIMEDOUT); + else if (mlsec > wait_time) + mlsec = wait_time; + + int res = lll_timed_wait (iptr, val, mlsec, flags); + if (res == KERN_TIMEDOUT) + return (ETIMEDOUT); + else if (wait_time < MAX_WAIT_TIME) + wait_time <<= 1; + } + } +} + +int __lll_robust_trylock (void *ptr) +{ + int *iptr = (int *)ptr; + int id = __getpid (); + unsigned int val = *iptr; + + if (!val) + { + if (atomic_compare_and_exchange_bool_acq (iptr, id, 0) == 0) + return (0); + } + else if (!valid_pid (val & LLL_OWNER_MASK) && + atomic_compare_and_exchange_bool_acq (iptr, id, val) == 0) + return (EOWNERDEAD); + + return (EBUSY); +} + +void __lll_robust_unlock (void *ptr, int flags) +{ + unsigned int val = atomic_load_relaxed((unsigned int *)ptr); + while (1) + { + if (val & LLL_WAITERS) + { + lll_set_wake (ptr, 0, flags); + break; + } + else if (atomic_compare_exchange_weak_release ((unsigned int *)ptr, &val, 0)) + break; + } +} diff --git a/hurd/hurdlock.h b/hurd/hurdlock.h new file mode 100644 index 0000000000..af57e25387 --- /dev/null +++ b/hurd/hurdlock.h @@ -0,0 +1,125 @@ +/* Low-level lock implementation. High-level Hurd helpers. + Copyright (C) 1999-2017 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <http://www.gnu.org/licenses/>. */ + +#ifndef _HURD_LOCK_H +#define _HURD_LOCK_H 1 + +#include <mach/lowlevellock.h> + +struct timespec; + +/* Flags for robust locks. */ +#define LLL_WAITERS (1U << 31) +#define LLL_DEAD_OWNER (1U << 30) + +#define LLL_OWNER_MASK ~(LLL_WAITERS | LLL_DEAD_OWNER) + +/* Wait on 64-bit address PTR, without blocking if its contents + are different from the pair <LO, HI>. */ +#define lll_xwait(ptr, lo, hi, flags) \ + __gsync_wait (__mach_task_self (), \ + (vm_offset_t)ptr, lo, hi, 0, flags | GSYNC_QUAD) + +/* Same as 'lll_wait', but only block for MLSEC milliseconds. */ +#define lll_timed_wait(ptr, val, mlsec, flags) \ + __gsync_wait (__mach_task_self (), \ + (vm_offset_t)ptr, val, 0, mlsec, flags | GSYNC_TIMED) + +/* Same as 'lll_xwait', but only block for MLSEC milliseconds. */ +#define lll_timed_xwait(ptr, lo, hi, mlsec, flags) \ + __gsync_wait (__mach_task_self (), (vm_offset_t)ptr, \ + lo, hi, mlsec, flags | GSYNC_TIMED | GSYNC_QUAD) + +/* Same as 'lll_wait', but only block until TSP elapses, + using clock CLK. */ +extern int __lll_abstimed_wait (void *__ptr, int __val, + const struct timespec *__tsp, int __flags, int __clk); + +/* Same as 'lll_xwait', but only block until TSP elapses, + using clock CLK. */ +extern int __lll_abstimed_xwait (void *__ptr, int __lo, int __hi, + const struct timespec *__tsp, int __flags, int __clk); + +/* Same as 'lll_lock', but return with an error if TSP elapses, + using clock CLK. */ +extern int __lll_abstimed_lock (void *__ptr, + const struct timespec *__tsp, int __flags, int __clk); + +/* Acquire the lock at PTR, but return with an error if + the process containing the owner thread dies. */ +extern int __lll_robust_lock (void *__ptr, int __flags); + +/* Same as '__lll_robust_lock', but only block until TSP + elapses, using clock CLK. */ +extern int __lll_robust_abstimed_lock (void *__ptr, + const struct timespec *__tsp, int __flags, int __clk); + +/* Same as '__lll_robust_lock', but return with an error + if the lock cannot be acquired without blocking. */ +extern int __lll_robust_trylock (void *__ptr); + +/* Wake one or more threads waiting on address PTR, + setting its value to VAL before doing so. */ +#define lll_set_wake(ptr, val, flags) \ + __gsync_wake (__mach_task_self (), \ + (vm_offset_t)ptr, val, flags | GSYNC_MUTATE) + +/* Release the robust lock at PTR. */ +extern void __lll_robust_unlock (void *__ptr, int __flags); + +/* Rearrange threads waiting on address SRC to instead wait on + DST, waking one of them if WAIT_ONE is non-zero. */ +#define lll_requeue(src, dst, wake_one, flags) \ + __gsync_requeue (__mach_task_self (), (vm_offset_t)src, \ + (vm_offset_t)dst, (boolean_t)wake_one, flags) + +/* The following are hacks that allow us to simulate optional + parameters in C, to avoid having to pass the clock id for + every one of these calls, defaulting to CLOCK_REALTIME if + no argument is passed. */ + +#define lll_abstimed_wait(ptr, val, tsp, flags, ...) \ + ({ \ + const clockid_t __clk[] = { CLOCK_REALTIME, ##__VA_ARGS__ }; \ + __lll_abstimed_wait ((ptr), (val), (tsp), (flags), \ + __clk[sizeof (__clk) / sizeof (__clk[0]) - 1]); \ + }) + +#define lll_abstimed_xwait(ptr, lo, hi, tsp, flags, ...) \ + ({ \ + const clockid_t __clk[] = { CLOCK_REALTIME, ##__VA_ARGS__ }; \ + __lll_abstimed_xwait ((ptr), (lo), (hi), (tsp), (flags), \ + __clk[sizeof (__clk) / sizeof (__clk[0]) - 1]); \ + }) + +#define lll_abstimed_lock(ptr, tsp, flags, ...) \ + ({ \ + const clockid_t __clk[] = { CLOCK_REALTIME, ##__VA_ARGS__ }; \ + __lll_abstimed_lock ((ptr), (tsp), (flags), \ + __clk[sizeof (__clk) / sizeof (__clk[0]) - 1]); \ + }) + +#define lll_robust_abstimed_lock(ptr, tsp, flags, ...) \ + ({ \ + const clockid_t __clk[] = { CLOCK_REALTIME, ##__VA_ARGS__ }; \ + __lll_robust_abstimed_lock ((ptr), (tsp), (flags), \ + __clk[sizeof (__clk) / sizeof (__clk[0]) - 1]); \ + }) + + +#endif diff --git a/hurd/hurdpid.c b/hurd/hurdpid.c index e1dd09316d..33659cc1ba 100644 --- a/hurd/hurdpid.c +++ b/hurd/hurdpid.c @@ -16,6 +16,8 @@ <http://www.gnu.org/licenses/>. */ #include <hurd.h> +#include <lowlevellock.h> + pid_t _hurd_pid, _hurd_ppid, _hurd_pgrp; int _hurd_orphaned; @@ -66,6 +68,7 @@ _S_msg_proc_newids (mach_port_t me, /* Notify any waiting user threads that the id change as been completed. */ ++_hurd_pids_changed_stamp; + lll_wake (&_hurd_pids_changed_stamp, GSYNC_BROADCAST); return 0; } diff --git a/hurd/hurdsig.c b/hurd/hurdsig.c index ea76be7e32..fdadd5b694 100644 --- a/hurd/hurdsig.c +++ b/hurd/hurdsig.c @@ -1362,14 +1362,14 @@ reauth_proc (mach_port_t new) __mach_port_destroy (__mach_task_self (), ref); /* Set the owner of the process here too. */ - mutex_lock (&_hurd_id.lock); + __mutex_lock (&_hurd_id.lock); if (!_hurd_check_ids ()) HURD_PORT_USE (&_hurd_ports[INIT_PORT_PROC], __proc_setowner (port, (_hurd_id.gen.nuids ? _hurd_id.gen.uids[0] : 0), !_hurd_id.gen.nuids)); - mutex_unlock (&_hurd_id.lock); + __mutex_unlock (&_hurd_id.lock); (void) &reauth_proc; /* Silence compiler warning. */ } diff --git a/hurd/setauth.c b/hurd/setauth.c index deece2010a..025be580e1 100644 --- a/hurd/setauth.c +++ b/hurd/setauth.c @@ -18,14 +18,13 @@ #include <hurd.h> #include <hurd/port.h> #include <hurd/id.h> +#include <hurdlock.h> #include "set-hooks.h" /* Things in the library which want to be run when the auth port changes. */ DEFINE_HOOK (_hurd_reauth_hook, (auth_t new_auth)); -#include <cthreads.h> -static struct mutex reauth_lock = MUTEX_INITIALIZER; - +static unsigned int reauth_lock = LLL_INITIALIZER; /* Set the auth port to NEW, and reauthenticate everything used by the library. */ diff --git a/mach/Makefile b/mach/Makefile index e0d1ffb1fa..2683587b2d 100644 --- a/mach/Makefile +++ b/mach/Makefile @@ -23,7 +23,7 @@ headers = mach_init.h mach.h mach_error.h mach-shortcuts.h mach/mach_traps.h \ $(interface-headers) mach/mach.h mach/mig_support.h mach/error.h \ $(lock-headers) machine-sp.h bits/mach/param.h lock = spin-solid spin-lock mutex-init mutex-solid -lock-headers = lock-intern.h machine-lock.h spin-lock.h +lock-headers = lock-intern.h spin-lock.h routines = $(mach-syscalls) $(mach-shortcuts) \ mach_init mig_strncpy msg \ mig-alloc mig-dealloc mig-reply \ diff --git a/mach/lock-intern.h b/mach/lock-intern.h index f8874c7561..ed8acb6aec 100644 --- a/mach/lock-intern.h +++ b/mach/lock-intern.h @@ -19,12 +19,19 @@ #define _LOCK_INTERN_H #include <sys/cdefs.h> -#include <machine-lock.h> +#if defined __USE_EXTERN_INLINES && defined _LIBC +# include <lowlevellock.h> +#endif #ifndef _EXTERN_INLINE #define _EXTERN_INLINE __extern_inline #endif +/* The type of a spin lock variable. */ +typedef unsigned int __spin_lock_t; + +/* Static initializer for spinlocks. */ +#define __SPIN_LOCK_INITIALIZER LLL_INITIALIZER /* Initialize LOCK. */ @@ -50,31 +57,47 @@ extern void __spin_lock (__spin_lock_t *__lock); _EXTERN_INLINE void __spin_lock (__spin_lock_t *__lock) { - if (! __spin_try_lock (__lock)) - __spin_lock_solid (__lock); + lll_lock (__lock, 0); } #endif - -/* Name space-clean internal interface to mutex locks. - Code internal to the C library uses these functions to lock and unlock - mutex locks. These locks are of type `struct mutex', defined in - <cthreads.h>. The functions here are name space-clean. If the program - is linked with the cthreads library, `__mutex_lock_solid' and - `__mutex_unlock_solid' will invoke the corresponding cthreads functions - to implement real mutex locks. If not, simple stub versions just use - spin locks. */ +/* Unlock LOCK. */ +extern void __spin_unlock (__spin_lock_t *__lock); +#if defined __USE_EXTERN_INLINES && defined _LIBC +_EXTERN_INLINE void +__spin_unlock (__spin_lock_t *__lock) +{ + lll_unlock (__lock, 0); +} +#endif -/* Initialize the newly allocated mutex lock LOCK for further use. */ -extern void __mutex_init (void *__lock); +/* Try to lock LOCK; return nonzero if we locked it, zero if another has. */ +extern int __spin_try_lock (__spin_lock_t *__lock); -/* Lock LOCK, blocking if we can't get it. */ -extern void __mutex_lock_solid (void *__lock); +#if defined __USE_EXTERN_INLINES && defined _LIBC +_EXTERN_INLINE int +__spin_try_lock (__spin_lock_t *__lock) +{ + return (lll_trylock (__lock) == 0); +} +#endif + +/* Return nonzero if LOCK is locked. */ +extern int __spin_lock_locked (__spin_lock_t *__lock); -/* Finish unlocking LOCK, after the spin lock LOCK->held has already been - unlocked. This function will wake up any thread waiting on LOCK. */ -extern void __mutex_unlock_solid (void *__lock); +#if defined __USE_EXTERN_INLINES && defined _LIBC +_EXTERN_INLINE int +__spin_lock_locked (__spin_lock_t *__lock) +{ + return (*(volatile __spin_lock_t *)__lock != 0); +} +#endif + +/* Name space-clean internal interface to mutex locks. */ + +/* Initialize the newly allocated mutex lock LOCK for further use. */ +extern void __mutex_init (void *__lock); /* Lock the mutex lock LOCK. */ @@ -84,8 +107,7 @@ extern void __mutex_lock (void *__lock); _EXTERN_INLINE void __mutex_lock (void *__lock) { - if (! __spin_try_lock ((__spin_lock_t *) __lock)) - __mutex_lock_solid (__lock); + __spin_lock ((__spin_lock_t *)__lock); } #endif @@ -97,8 +119,7 @@ extern void __mutex_unlock (void *__lock); _EXTERN_INLINE void __mutex_unlock (void *__lock) { - __spin_unlock ((__spin_lock_t *) __lock); - __mutex_unlock_solid (__lock); + __spin_unlock ((__spin_lock_t *)__lock); } #endif @@ -109,7 +130,7 @@ extern int __mutex_trylock (void *__lock); _EXTERN_INLINE int __mutex_trylock (void *__lock) { - return __spin_try_lock ((__spin_lock_t *) __lock); + return (__spin_try_lock ((__spin_lock_t *)__lock)); } #endif diff --git a/mach/lowlevellock.h b/mach/lowlevellock.h new file mode 100644 index 0000000000..20c66ca979 --- /dev/null +++ b/mach/lowlevellock.h @@ -0,0 +1,81 @@ +/* Low-level lock implementation. Mach gsync-based version. + Copyright (C) 1994-2017 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <http://www.gnu.org/licenses/>. */ + +#ifndef _MACH_LOWLEVELLOCK_H +#define _MACH_LOWLEVELLOCK_H 1 + +#include <mach/gnumach.h> +#include <atomic.h> + +/* Gsync flags. */ +#ifndef GSYNC_SHARED + #define GSYNC_SHARED 0x01 + #define GSYNC_QUAD 0x02 + #define GSYNC_TIMED 0x04 + #define GSYNC_BROADCAST 0x08 + #define GSYNC_MUTATE 0x10 +#endif + +/* Static initializer for low-level locks. */ +#define LLL_INITIALIZER 0 + +/* Wait on address PTR, without blocking if its contents + * are different from VAL. */ +#define lll_wait(ptr, val, flags) \ + __gsync_wait (__mach_task_self (), \ + (vm_offset_t)(ptr), (val), 0, 0, (flags)) + +/* Wake one or more threads waiting on address PTR. */ +#define lll_wake(ptr, flags) \ + __gsync_wake (__mach_task_self (), (vm_offset_t)(ptr), 0, (flags)) + +/* Acquire the lock at PTR. */ +#define lll_lock(ptr, flags) \ + ({ \ + int *__iptr = (int *)(ptr); \ + int __flags = (flags); \ + if (*__iptr != 0 || \ + atomic_compare_and_exchange_bool_acq (__iptr, 1, 0) != 0) \ + while (1) \ + { \ + if (atomic_exchange_acq (__iptr, 2) == 0) \ + break; \ + lll_wait (__iptr, 2, __flags); \ + } \ + (void)0; \ + }) + +/* Try to acquire the lock at PTR, without blocking. + Evaluates to zero on success. */ +#define lll_trylock(ptr) \ + ({ \ + int *__iptr = (int *)(ptr); \ + *__iptr == 0 && \ + atomic_compare_and_exchange_bool_acq (__iptr, 1, 0) == 0 ? 0 : -1; \ + }) + +/* Release the lock at PTR. */ +#define lll_unlock(ptr, flags) \ + ({ \ + int *__iptr = (int *)(ptr); \ + if (atomic_exchange_rel (__iptr, 0) == 2) \ + lll_wake (__iptr, (flags)); \ + (void)0; \ + }) + +#endif diff --git a/mach/mutex-init.c b/mach/mutex-init.c index cab0a86fec..776fec5506 100644 --- a/mach/mutex-init.c +++ b/mach/mutex-init.c @@ -17,13 +17,10 @@ <http://www.gnu.org/licenses/>. */ #include <lock-intern.h> -#include <cthreads.h> +#include <lowlevellock.h> void __mutex_init (void *lock) { - /* This happens to be name space-safe because it is a macro. - It invokes only spin_lock_init, which is a macro for __spin_lock_init; - and cthread_queue_init, which is a macro for some simple code. */ - mutex_init ((struct mutex *) lock); + *(int *)lock = LLL_INITIALIZER; } diff --git a/manual/errno.texi b/manual/errno.texi index 73272fd884..8917cccb1e 100644 --- a/manual/errno.texi +++ b/manual/errno.texi @@ -882,6 +882,16 @@ the normal result is for the operations affected to complete with this error; @pxref{Cancel AIO Operations}. @end deftypevr +@deftypevr Macro int EOWNERDEAD +@standards{GNU, errno.h} +@errno{EOWNERDEAD, 120, Owner died} +@end deftypevr + +@deftypevr Macro int ENOTRECOVERABLE +@standards{GNU, errno.h} +@errno{ENOTRECOVERABLE, 121, State not recoverable} +@end deftypevr + @emph{The following error codes are defined by the Linux/i386 kernel. They are not yet documented.} diff --git a/sysdeps/mach/Makefile b/sysdeps/mach/Makefile index 2b48b13f61..475894b046 100644 --- a/sysdeps/mach/Makefile +++ b/sysdeps/mach/Makefile @@ -50,4 +50,30 @@ mach-before-compile: before-compile += $(mach-before-compile) endif +ifeq (crypt,$(subdir)) + LDLIBS-crypt.so += $(objdir)/mach/libmachuser.so +else ifeq (dlfcn,$(subdir)) + LDLIBS-dl.so += $(objdir)/mach/libmachuser.so +else ifeq (nis,$(subdir)) + LDLIBS-nsl.so += $(objdir)/mach/libmachuser.so + LDLIBS-nss_nis.so += $(objdir)/mach/libmachuser.so + LDLIBS-nss_nisplus.so += $(objdir)/mach/libmachuser.so + LDLIBS-nss_compat.so += $(objdir)/mach/libmachuser.so +else ifeq (nss,$(subdir)) + LDLIBS-nss.so += $(objdir)/mach/libmachuser.so + LDLIBS-nss_files.so += $(objdir)/mach/libmachuser.so + LDLIBS-nss_db.so += $(objdir)/mach/libmachuser.so + LDLIBS-nss_compat.so += $(objdir)/mach/libmachuser.so +else ifeq (hesiod,$(subdir)) + LDLIBS-nss_hesiod.so += $(objdir)/mach/libmachuser.so +else ifeq (posix,$(subdir)) + LDLIBS-tst-rfc3484 += $(objdir)/mach/libmachuser.so + LDLIBS-tst-rfc3484-2 += $(objdir)/mach/libmachuser.so + LDLIBS-tst-rfc3484-3 += $(objdir)/mach/libmachuser.so +else ifeq (nscd,$(subdir)) + LDLIBS-nscd += $(objdir)/mach/libmachuser.so +endif + +LDLIBS-pthread.so += $(objdir)/mach/libmachuser.so + endif # in-Makerules diff --git a/sysdeps/mach/hurd/bits/errno.h b/sysdeps/mach/hurd/bits/errno.h index f16cd51a63..999730721f 100644 --- a/sysdeps/mach/hurd/bits/errno.h +++ b/sysdeps/mach/hurd/bits/errno.h @@ -127,6 +127,8 @@ enum __error_t_codes EPROTO = 0x40000074, /* Protocol error */ ETIME = 0x40000075, /* Timer expired */ ECANCELED = 0x40000077, /* Operation canceled */ + EOWNERDEAD = 0x40000078, /* Robust mutex owner died */ + ENOTRECOVERABLE = 0x40000079, /* Robust mutex irrecoverable */ /* Errors from <mach/message.h>. */ EMACH_SEND_IN_PROGRESS = 0x10000001, @@ -322,6 +324,8 @@ enum __error_t_codes #define EPROTO 0x40000074 #define ETIME 0x40000075 #define ECANCELED 0x40000077 +#define EOWNERDEAD 0x40000078 +#define ENOTRECOVERABLE 0x40000079 /* Errors from <mach/message.h>. */ #define EMACH_SEND_IN_PROGRESS 0x10000001 @@ -405,6 +409,6 @@ enum __error_t_codes #define ED_NO_MEMORY 2508 #define ED_READ_ONLY 2509 -#define _HURD_ERRNOS 120 +#define _HURD_ERRNOS 122 #endif /* bits/errno.h. */ diff --git a/sysdeps/mach/hurd/cthreads.c b/sysdeps/mach/hurd/cthreads.c index 585650522a..05c48e4e4c 100644 --- a/sysdeps/mach/hurd/cthreads.c +++ b/sysdeps/mach/hurd/cthreads.c @@ -52,13 +52,3 @@ __cthread_setspecific (cthread_key_t key, void *val) __set_errno (ENOSYS); return -1; } - -/* Call cthread_getspecific which gets a pointer to the return value instead - of just returning it. */ -void * -__libc_getspecific (cthread_key_t key) -{ - void *val; - __cthread_getspecific (key, &val); - return val; -} diff --git a/sysdeps/mach/hurd/libc-lock.h b/sysdeps/mach/hurd/libc-lock.h deleted file mode 100644 index f5a1f66a23..0000000000 --- a/sysdeps/mach/hurd/libc-lock.h +++ /dev/null @@ -1,216 +0,0 @@ -/* libc-internal interface for mutex locks. Hurd version using Mach cthreads. - Copyright (C) 1996-2018 Free Software Foundation, Inc. - This file is part of the GNU C Library. - - The GNU C Library is free software; you can redistribute it and/or - modify it under the terms of the GNU Lesser General Public - License as published by the Free Software Foundation; either - version 2.1 of the License, or (at your option) any later version. - - The GNU C Library is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public - License along with the GNU C Library; if not, see - <http://www.gnu.org/licenses/>. */ - -#ifndef _LIBC_LOCK_H -#define _LIBC_LOCK_H 1 - -#if (_LIBC - 0) || (_CTHREADS_ - 0) -#include <cthreads.h> - -/* The locking here is very inexpensive, even for inlining. */ -#define _IO_lock_inexpensive 1 - -typedef struct mutex __libc_lock_t; -typedef struct -{ - struct mutex mutex; - void *owner; - int count; -} __libc_lock_recursive_t; -typedef __libc_lock_recursive_t __rtld_lock_recursive_t; - -extern char __libc_lock_self0[0]; -#define __libc_lock_owner_self() (__LIBC_NO_TLS () ? &__libc_lock_self0 : THREAD_SELF) - -#else -typedef struct __libc_lock_opaque__ __libc_lock_t; -typedef struct __libc_lock_recursive_opaque__ __libc_lock_recursive_t; -#endif - -/* Define a lock variable NAME with storage class CLASS. The lock must be - initialized with __libc_lock_init before it can be used (or define it - with __libc_lock_define_initialized, below). Use `extern' for CLASS to - declare a lock defined in another module. In public structure - definitions you must use a pointer to the lock structure (i.e., NAME - begins with a `*'), because its storage size will not be known outside - of libc. */ -#define __libc_lock_define(CLASS,NAME) \ - CLASS __libc_lock_t NAME; - -/* Define an initialized lock variable NAME with storage class CLASS. */ -#define _LIBC_LOCK_INITIALIZER MUTEX_INITIALIZER -#define __libc_lock_define_initialized(CLASS,NAME) \ - CLASS __libc_lock_t NAME = _LIBC_LOCK_INITIALIZER; - -/* Initialize the named lock variable, leaving it in a consistent, unlocked - state. */ -#define __libc_lock_init(NAME) __mutex_init (&(NAME)) - -/* Finalize the named lock variable, which must be locked. It cannot be - used again until __libc_lock_init is called again on it. This must be - called on a lock variable before the containing storage is reused. */ -#define __libc_lock_fini(NAME) __mutex_unlock (&(NAME)) -#define __libc_lock_fini_recursive(NAME) __mutex_unlock (&(NAME).mutex) -#define __rtld_lock_fini_recursive(NAME) __mutex_unlock (&(NAME).mutex) - - -/* Lock the named lock variable. */ -#define __libc_lock_lock(NAME) __mutex_lock (&(NAME)) - -/* Lock the named lock variable. */ -#define __libc_lock_trylock(NAME) (!__mutex_trylock (&(NAME))) - -/* Unlock the named lock variable. */ -#define __libc_lock_unlock(NAME) __mutex_unlock (&(NAME)) - - -#define __libc_lock_define_recursive(CLASS,NAME) \ - CLASS __libc_lock_recursive_t NAME; -#define _LIBC_LOCK_RECURSIVE_INITIALIZER { MUTEX_INITIALIZER, 0, 0 } -#define __libc_lock_define_initialized_recursive(CLASS,NAME) \ - CLASS __libc_lock_recursive_t NAME = _LIBC_LOCK_RECURSIVE_INITIALIZER; - -#define __rtld_lock_define_recursive(CLASS,NAME) \ - __libc_lock_define_recursive (CLASS, NAME) -#define _RTLD_LOCK_RECURSIVE_INITIALIZER \ - _LIBC_LOCK_RECURSIVE_INITIALIZER -#define __rtld_lock_define_initialized_recursive(CLASS,NAME) \ - __libc_lock_define_initialized_recursive (CLASS, NAME) - -#define __libc_lock_init_recursive(NAME) \ - ({ __libc_lock_recursive_t *const __lock = &(NAME); \ - __lock->owner = 0; mutex_init (&__lock->mutex); }) - -#define __libc_lock_trylock_recursive(NAME) \ - ({ __libc_lock_recursive_t *const __lock = &(NAME); \ - void *__self = __libc_lock_owner_self (); \ - __mutex_trylock (&__lock->mutex) \ - ? (__lock->owner = __self, __lock->count = 1, 0) \ - : __lock->owner == __self ? (++__lock->count, 0) : 1; }) - -#define __libc_lock_lock_recursive(NAME) \ - ({ __libc_lock_recursive_t *const __lock = &(NAME); \ - void *__self = __libc_lock_owner_self (); \ - if (__mutex_trylock (&__lock->mutex) \ - || (__lock->owner != __self \ - && (__mutex_lock (&__lock->mutex), 1))) \ - __lock->owner = __self, __lock->count = 1; \ - else \ - ++__lock->count; \ - }) -#define __libc_lock_unlock_recursive(NAME) \ - ({ __libc_lock_recursive_t *const __lock = &(NAME); \ - if (--__lock->count == 0) \ - { \ - __lock->owner = 0; \ - __mutex_unlock (&__lock->mutex); \ - } \ - }) - - -#define __rtld_lock_initialize(NAME) \ - (void) ((NAME) = (__rtld_lock_recursive_t) _RTLD_LOCK_RECURSIVE_INITIALIZER) -#define __rtld_lock_trylock_recursive(NAME) \ - __libc_lock_trylock_recursive (NAME) -#define __rtld_lock_lock_recursive(NAME) \ - __libc_lock_lock_recursive(NAME) -#define __rtld_lock_unlock_recursive(NAME) \ - __libc_lock_unlock_recursive (NAME) - - -/* XXX for now */ -#define __libc_rwlock_define __libc_lock_define -#define __libc_rwlock_define_initialized __libc_lock_define_initialized -#define __libc_rwlock_init __libc_lock_init -#define __libc_rwlock_fini __libc_lock_fini -#define __libc_rwlock_rdlock __libc_lock_lock -#define __libc_rwlock_wrlock __libc_lock_lock -#define __libc_rwlock_tryrdlock __libc_lock_trylock -#define __libc_rwlock_trywrlock __libc_lock_trylock -#define __libc_rwlock_unlock __libc_lock_unlock - - -/* Start a critical region with a cleanup function */ -#define __libc_cleanup_region_start(DOIT, FCT, ARG) \ -{ \ - typeof (***(FCT)) *__save_FCT = (DOIT) ? (FCT) : 0; \ - typeof (ARG) __save_ARG = ARG; \ - /* close brace is in __libc_cleanup_region_end below. */ - -/* End a critical region started with __libc_cleanup_region_start. */ -#define __libc_cleanup_region_end(DOIT) \ - if ((DOIT) && __save_FCT != 0) \ - (*__save_FCT)(__save_ARG); \ -} - -/* Sometimes we have to exit the block in the middle. */ -#define __libc_cleanup_end(DOIT) \ - if ((DOIT) && __save_FCT != 0) \ - (*__save_FCT)(__save_ARG); \ - -#define __libc_cleanup_push(fct, arg) __libc_cleanup_region_start (1, fct, arg) -#define __libc_cleanup_pop(execute) __libc_cleanup_region_end (execute) - -#if (_CTHREADS_ - 0) - -/* Use mutexes as once control variables. */ - -struct __libc_once - { - __libc_lock_t lock; - int done; - }; - -#define __libc_once_define(CLASS,NAME) \ - CLASS struct __libc_once NAME = { MUTEX_INITIALIZER, 0 } - -/* Call handler iff the first call. */ -#define __libc_once(ONCE_CONTROL, INIT_FUNCTION) \ - do { \ - __libc_lock_lock (ONCE_CONTROL.lock); \ - if (!ONCE_CONTROL.done) \ - (INIT_FUNCTION) (); \ - ONCE_CONTROL.done = 1; \ - __libc_lock_unlock (ONCE_CONTROL.lock); \ - } while (0) - -/* Get once control variable. */ -#define __libc_once_get(ONCE_CONTROL) ((ONCE_CONTROL).done != 0) - -#ifdef _LIBC -/* We need portable names for some functions. E.g., when they are - used as argument to __libc_cleanup_region_start. */ -#define __libc_mutex_unlock __mutex_unlock -#endif - -/* Type for key of thread specific data. */ -typedef cthread_key_t __libc_key_t; - -#define __libc_key_create(KEY,DEST) __cthread_keycreate (KEY) -#define __libc_setspecific(KEY,VAL) __cthread_setspecific (KEY, VAL) -void *__libc_getspecific (__libc_key_t key); - -#endif /* _CTHREADS_ */ - -/* Hide the definitions which are only supposed to be used inside libc in - a separate file. This file is not present in the installation! */ -#ifdef _LIBC -# include <libc-lockP.h> -#endif - -#endif /* libc-lock.h */ diff --git a/sysdeps/mach/hurd/setpgid.c b/sysdeps/mach/hurd/setpgid.c index 32186a25de..98b1341cfa 100644 --- a/sysdeps/mach/hurd/setpgid.c +++ b/sysdeps/mach/hurd/setpgid.c @@ -19,6 +19,7 @@ #include <unistd.h> #include <hurd.h> #include <hurd/port.h> +#include <lowlevellock.h> /* Set the process group ID of the process matching PID to PGID. If PID is zero, the current process's process group ID is set. @@ -38,14 +39,7 @@ __setpgid (pid_t pid, pid_t pgid) /* Synchronize with the signal thread to make sure we have received and processed proc_newids before returning to the user. */ while (_hurd_pids_changed_stamp == stamp) - { -#ifdef noteven - /* XXX we have no need for a mutex, but cthreads demands one. */ - __condition_wait (&_hurd_pids_changed_sync, NULL); -#else - __swtch_pri(0); -#endif - } + lll_wait (&_hurd_pids_changed_stamp, stamp, 0); return 0; diff --git a/sysdeps/mach/hurd/setsid.c b/sysdeps/mach/hurd/setsid.c index 0f6b24b1d2..7b989361d1 100644 --- a/sysdeps/mach/hurd/setsid.c +++ b/sysdeps/mach/hurd/setsid.c @@ -21,6 +21,7 @@ #include <hurd/port.h> #include <hurd/fd.h> #include <hurd/ioctl.h> +#include <lowlevellock.h> /* Create a new session with the calling process as its leader. The process group IDs of the session and the calling process @@ -55,14 +56,7 @@ __setsid (void) returned by `getpgrp ()' in other threads) has been updated before we return. */ while (_hurd_pids_changed_stamp == stamp) - { -#ifdef noteven - /* XXX we have no need for a mutex, but cthreads demands one. */ - __condition_wait (&_hurd_pids_changed_sync, NULL); -#else - __swtch_pri (0); -#endif - } + lll_wait (&_hurd_pids_changed_stamp, stamp, 0); } HURD_CRITICAL_END; diff --git a/sysdeps/mach/libc-lock.h b/sysdeps/mach/libc-lock.h index 1bb0235cf2..2c64019b33 100644 --- a/sysdeps/mach/libc-lock.h +++ b/sysdeps/mach/libc-lock.h @@ -20,15 +20,32 @@ #define _LIBC_LOCK_H 1 #ifdef _LIBC -#include <cthreads.h> -#define __libc_lock_t struct mutex + +#include <tls.h> +#include <lowlevellock.h> + +/* The locking here is very inexpensive, even for inlining. */ +#define _IO_lock_inexpensive 1 + +typedef unsigned int __libc_lock_t; +typedef struct +{ + __libc_lock_t lock; + int cnt; + void *owner; +} __libc_lock_recursive_t; + +typedef __libc_lock_recursive_t __rtld_lock_recursive_t; + +extern char __libc_lock_self0[0]; +#define __libc_lock_owner_self() \ + (__LIBC_NO_TLS () ? (void *)&__libc_lock_self0 : THREAD_SELF) + #else typedef struct __libc_lock_opaque__ __libc_lock_t; +typedef struct __libc_lock_recursive_opaque__ __libc_lock_recursive_t; #endif -/* Type for key of thread specific data. */ -typedef cthread_key_t __libc_key_t; - /* Define a lock variable NAME with storage class CLASS. The lock must be initialized with __libc_lock_init before it can be used (or define it with __libc_lock_define_initialized, below). Use `extern' for CLASS to @@ -40,27 +57,97 @@ typedef cthread_key_t __libc_key_t; CLASS __libc_lock_t NAME; /* Define an initialized lock variable NAME with storage class CLASS. */ +#define _LIBC_LOCK_INITIALIZER LLL_INITIALIZER #define __libc_lock_define_initialized(CLASS,NAME) \ - CLASS __libc_lock_t NAME = MUTEX_INITIALIZER; + CLASS __libc_lock_t NAME = LLL_INITIALIZER; /* Initialize the named lock variable, leaving it in a consistent, unlocked state. */ -#define __libc_lock_init(NAME) __mutex_init (&(NAME)) +#define __libc_lock_init(NAME) (NAME) = LLL_INITIALIZER /* Finalize the named lock variable, which must be locked. It cannot be used again until __libc_lock_init is called again on it. This must be called on a lock variable before the containing storage is reused. */ -#define __libc_lock_fini(NAME) __mutex_unlock (&(NAME)) +#define __libc_lock_fini __libc_lock_unlock +#define __libc_lock_fini_recursive __libc_lock_unlock_recursive +#define __rtld_lock_fini_recursive __rtld_lock_unlock_recursive /* Lock the named lock variable. */ -#define __libc_lock_lock(NAME) __mutex_lock (&(NAME)) +#define __libc_lock_lock(NAME) \ + ({ lll_lock (&(NAME), 0); 0; }) /* Lock the named lock variable. */ -#define __libc_lock_trylock(NAME) (!__mutex_trylock (&(NAME))) +#define __libc_lock_trylock(NAME) lll_trylock (&(NAME)) /* Unlock the named lock variable. */ -#define __libc_lock_unlock(NAME) __mutex_unlock (&(NAME)) - +#define __libc_lock_unlock(NAME) \ + ({ lll_unlock (&(NAME), 0); 0; }) + +#define __libc_lock_define_recursive(CLASS,NAME) \ + CLASS __libc_lock_recursive_t NAME; + +#define _LIBC_LOCK_RECURSIVE_INITIALIZER { LLL_INITIALIZER, 0, 0 } + +#define __libc_lock_define_initialized_recursive(CLASS,NAME) \ + CLASS __libc_lock_recursive_t NAME = _LIBC_LOCK_RECURSIVE_INITIALIZER; + +#define __rtld_lock_define_recursive(CLASS,NAME) \ + __libc_lock_define_recursive (CLASS, NAME) +#define _RTLD_LOCK_RECURSIVE_INITIALIZER \ + _LIBC_LOCK_RECURSIVE_INITIALIZER +#define __rtld_lock_define_initialized_recursive(CLASS,NAME) \ + __libc_lock_define_initialized_recursive (CLASS, NAME) + +#define __libc_lock_init_recursive(NAME) \ + ({ \ + (NAME) = (__libc_lock_recursive_t)_LIBC_LOCK_RECURSIVE_INITIALIZER; \ + 0; \ + }) + +#define __libc_lock_trylock_recursive(NAME) \ + ({ \ + __libc_lock_recursive_t *const __lock = &(NAME); \ + void *__self = __libc_lock_owner_self (); \ + int __r = 0; \ + if (__self == __lock->owner) \ + ++__lock->cnt; \ + else if ((__r = lll_trylock (&__lock->lock)) == 0) \ + __lock->owner = __self, __lock->cnt = 1; \ + __r; \ + }) + +#define __libc_lock_lock_recursive(NAME) \ + ({ \ + __libc_lock_recursive_t *const __lock = &(NAME); \ + void *__self = __libc_lock_owner_self (); \ + if (__self != __lock->owner) \ + { \ + lll_lock (&__lock->lock, 0); \ + __lock->owner = __self; \ + } \ + ++__lock->cnt; \ + (void)0; \ + }) + +#define __libc_lock_unlock_recursive(NAME) \ + ({ \ + __libc_lock_recursive_t *const __lock = &(NAME); \ + if (--__lock->cnt == 0) \ + { \ + __lock->owner = 0; \ + lll_unlock (&__lock->lock, 0); \ + } \ + }) + + +#define __rtld_lock_initialize(NAME) \ + (void) ((NAME) = (__rtld_lock_recursive_t) _RTLD_LOCK_RECURSIVE_INITIALIZER) +#define __rtld_lock_trylock_recursive(NAME) \ + __libc_lock_trylock_recursive (NAME) +#define __rtld_lock_lock_recursive(NAME) \ + __libc_lock_lock_recursive(NAME) +#define __rtld_lock_unlock_recursive(NAME) \ + __libc_lock_unlock_recursive (NAME) /* XXX for now */ #define __libc_rwlock_define __libc_lock_define @@ -95,7 +182,7 @@ __libc_cleanup_fct (struct __libc_cleanup_frame *framep) __attribute__ ((__cleanup__ (__libc_cleanup_fct))) = \ { .__fct = (FCT), .__argp = (ARG), .__doit = (DOIT) }; -/* This one closes the brace above. */ +/* This one closes the brace above. */ #define __libc_cleanup_region_end(DOIT) \ __cleanup.__doit = (DOIT); \ } \ @@ -106,7 +193,7 @@ __libc_cleanup_fct (struct __libc_cleanup_frame *framep) #define __libc_cleanup_push(fct, arg) __libc_cleanup_region_start (1, fct, arg) #define __libc_cleanup_pop(execute) __libc_cleanup_region_end (execute) -/* Use mutexes as once control variables. */ +/* Use mutexes as once control variables. */ struct __libc_once { @@ -115,8 +202,7 @@ struct __libc_once }; #define __libc_once_define(CLASS,NAME) \ - CLASS struct __libc_once NAME = { MUTEX_INITIALIZER, 0 } - + CLASS struct __libc_once NAME = { _LIBC_LOCK_INITIALIZER, 0 } /* Call handler iff the first call. */ #define __libc_once(ONCE_CONTROL, INIT_FUNCTION) \ @@ -134,25 +220,11 @@ struct __libc_once #ifdef _LIBC /* We need portable names for some functions. E.g., when they are used as argument to __libc_cleanup_region_start. */ -#define __libc_mutex_unlock __mutex_unlock -#endif +#define __libc_mutex_unlock __libc_lock_unlock -#define __libc_key_create(KEY,DEST) __cthread_keycreate (KEY) -#define __libc_setspecific(KEY,VAL) __cthread_setspecific (KEY, VAL) -void *__libc_getspecific (__libc_key_t key); - -/* XXX until cthreads supports recursive locks */ -#define __libc_lock_define_initialized_recursive __libc_lock_define_initialized -#define __libc_lock_init_recursive __libc_lock_init -#define __libc_lock_fini_recursive __libc_lock_fini -#define __libc_lock_trylock_recursive __libc_lock_trylock -#define __libc_lock_unlock_recursive __libc_lock_unlock -#define __libc_lock_lock_recursive __libc_lock_lock - -#define __rtld_lock_define_initialized_recursive __libc_lock_define_initialized -#define __rtld_lock_fini_recursive __libc_lock_fini -#define __rtld_lock_trylock_recursive __libc_lock_trylock -#define __rtld_lock_unlock_recursive __libc_lock_unlock -#define __rtld_lock_lock_recursive __libc_lock_lock +/* Hide the definitions which are only supposed to be used inside libc in + a separate file. This file is not present in the installation! */ +# include <libc-lockP.h> +#endif #endif /* libc-lock.h */ |