diff options
Diffstat (limited to 'nptl/sysdeps/unix/sysv/linux/timer_create.c')
| -rw-r--r-- | nptl/sysdeps/unix/sysv/linux/timer_create.c | 340 |
1 files changed, 139 insertions, 201 deletions
diff --git a/nptl/sysdeps/unix/sysv/linux/timer_create.c b/nptl/sysdeps/unix/sysv/linux/timer_create.c index 8d365eb9a4..c2865fb4f3 100644 --- a/nptl/sysdeps/unix/sysv/linux/timer_create.c +++ b/nptl/sysdeps/unix/sysv/linux/timer_create.c @@ -1,4 +1,4 @@ -/* Copyright (C) 2003,2004, 2007, 2009 Free Software Foundation, Inc. +/* Copyright (C) 2003-2012 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Ulrich Drepper <drepper@redhat.com>, 2003. @@ -30,21 +30,9 @@ #include "kernel-posix-cpu-timers.h" -#ifdef __NR_timer_create -# ifndef __ASSUME_POSIX_TIMERS -static int compat_timer_create (clockid_t clock_id, struct sigevent *evp, - timer_t *timerid); -# define timer_create static compat_timer_create -# include <nptl/sysdeps/pthread/timer_create.c> -# undef timer_create - -/* Nonzero if the system calls are not available. */ -int __no_posix_timers attribute_hidden; -# endif - -# ifdef timer_create_alias -# define timer_create timer_create_alias -# endif +#ifdef timer_create_alias +# define timer_create timer_create_alias +#endif int @@ -53,190 +41,140 @@ timer_create (clock_id, evp, timerid) struct sigevent *evp; timer_t *timerid; { -# undef timer_create -# ifndef __ASSUME_POSIX_TIMERS - if (__no_posix_timers >= 0) -# endif - { - clockid_t syscall_clockid = (clock_id == CLOCK_PROCESS_CPUTIME_ID - ? MAKE_PROCESS_CPUCLOCK (0, CPUCLOCK_SCHED) - : clock_id == CLOCK_THREAD_CPUTIME_ID - ? MAKE_THREAD_CPUCLOCK (0, CPUCLOCK_SCHED) - : clock_id); - - /* If the user wants notification via a thread we need to handle - this special. */ - if (evp == NULL - || __builtin_expect (evp->sigev_notify != SIGEV_THREAD, 1)) - { - struct sigevent local_evp; - - /* We avoid allocating too much memory by basically - using struct timer as a derived class with the - first two elements being in the superclass. We only - need these two elements here. */ - struct timer *newp = (struct timer *) malloc (offsetof (struct timer, - thrfunc)); - if (newp == NULL) - /* No more memory. */ +#undef timer_create + { + clockid_t syscall_clockid = (clock_id == CLOCK_PROCESS_CPUTIME_ID + ? MAKE_PROCESS_CPUCLOCK (0, CPUCLOCK_SCHED) + : clock_id == CLOCK_THREAD_CPUTIME_ID + ? MAKE_THREAD_CPUCLOCK (0, CPUCLOCK_SCHED) + : clock_id); + + /* If the user wants notification via a thread we need to handle + this special. */ + if (evp == NULL + || __builtin_expect (evp->sigev_notify != SIGEV_THREAD, 1)) + { + struct sigevent local_evp; + + /* We avoid allocating too much memory by basically + using struct timer as a derived class with the + first two elements being in the superclass. We only + need these two elements here. */ + struct timer *newp = (struct timer *) malloc (offsetof (struct timer, + thrfunc)); + if (newp == NULL) + /* No more memory. */ + return -1; + + if (evp == NULL) + { + /* The kernel has to pass up the timer ID which is a + userlevel object. Therefore we cannot leave it up to + the kernel to determine it. */ + local_evp.sigev_notify = SIGEV_SIGNAL; + local_evp.sigev_signo = SIGALRM; + local_evp.sigev_value.sival_ptr = newp; + + evp = &local_evp; + } + + kernel_timer_t ktimerid; + int retval = INLINE_SYSCALL (timer_create, 3, syscall_clockid, evp, + &ktimerid); + + if (retval != -1) + { + newp->sigev_notify = (evp != NULL + ? evp->sigev_notify : SIGEV_SIGNAL); + newp->ktimerid = ktimerid; + + *timerid = (timer_t) newp; + } + else + { + /* Cannot allocate the timer, fail. */ + free (newp); + retval = -1; + } + + return retval; + } + else + { + /* Create the helper thread. */ + pthread_once (&__helper_once, __start_helper_thread); + if (__helper_tid == 0) + { + /* No resources to start the helper thread. */ + __set_errno (EAGAIN); return -1; - - if (evp == NULL) - { - /* The kernel has to pass up the timer ID which is a - userlevel object. Therefore we cannot leave it up to - the kernel to determine it. */ - local_evp.sigev_notify = SIGEV_SIGNAL; - local_evp.sigev_signo = SIGALRM; - local_evp.sigev_value.sival_ptr = newp; - - evp = &local_evp; - } - - kernel_timer_t ktimerid; - int retval = INLINE_SYSCALL (timer_create, 3, syscall_clockid, evp, - &ktimerid); - -# ifndef __ASSUME_POSIX_TIMERS - if (retval != -1 || errno != ENOSYS) -# endif - { -# ifndef __ASSUME_POSIX_TIMERS - __no_posix_timers = 1; -# endif - - if (retval != -1) - { - newp->sigev_notify = (evp != NULL - ? evp->sigev_notify : SIGEV_SIGNAL); - newp->ktimerid = ktimerid; - - *timerid = (timer_t) newp; - } - else - { - /* Cannot allocate the timer, fail. */ - free (newp); - retval = -1; - } - - return retval; - } - - free (newp); - -# ifndef __ASSUME_POSIX_TIMERS - /* When we come here the syscall does not exist. Make sure we - do not try to use it again. */ - __no_posix_timers = -1; -# endif - } - else - { -# ifndef __ASSUME_POSIX_TIMERS - /* Make sure we have the necessary kernel support. */ - if (__no_posix_timers == 0) - { - INTERNAL_SYSCALL_DECL (err); - struct timespec ts; - int res; - res = INTERNAL_SYSCALL (clock_getres, err, 2, - CLOCK_REALTIME, &ts); - __no_posix_timers = (INTERNAL_SYSCALL_ERROR_P (res, err) - ? -1 : 1); - } - - if (__no_posix_timers > 0) -# endif - { - /* Create the helper thread. */ - pthread_once (&__helper_once, __start_helper_thread); - if (__helper_tid == 0) - { - /* No resources to start the helper thread. */ - __set_errno (EAGAIN); - return -1; - } - - struct timer *newp; - newp = (struct timer *) malloc (sizeof (struct timer)); - if (newp == NULL) - return -1; - - /* Copy the thread parameters the user provided. */ - newp->sival = evp->sigev_value; - newp->thrfunc = evp->sigev_notify_function; - newp->sigev_notify = SIGEV_THREAD; - - /* We cannot simply copy the thread attributes since the - implementation might keep internal information for - each instance. */ - (void) pthread_attr_init (&newp->attr); - if (evp->sigev_notify_attributes != NULL) - { - struct pthread_attr *nattr; - struct pthread_attr *oattr; - - nattr = (struct pthread_attr *) &newp->attr; - oattr = (struct pthread_attr *) evp->sigev_notify_attributes; - - nattr->schedparam = oattr->schedparam; - nattr->schedpolicy = oattr->schedpolicy; - nattr->flags = oattr->flags; - nattr->guardsize = oattr->guardsize; - nattr->stackaddr = oattr->stackaddr; - nattr->stacksize = oattr->stacksize; - } - - /* In any case set the detach flag. */ - (void) pthread_attr_setdetachstate (&newp->attr, - PTHREAD_CREATE_DETACHED); - - /* Create the event structure for the kernel timer. */ - struct sigevent sev = - { .sigev_value.sival_ptr = newp, - .sigev_signo = SIGTIMER, - .sigev_notify = SIGEV_SIGNAL | SIGEV_THREAD_ID, - ._sigev_un = { ._pad = { [0] = __helper_tid } } }; - - /* Create the timer. */ - INTERNAL_SYSCALL_DECL (err); - int res; - res = INTERNAL_SYSCALL (timer_create, err, 3, - syscall_clockid, &sev, &newp->ktimerid); - if (! INTERNAL_SYSCALL_ERROR_P (res, err)) - { - /* Add to the queue of active timers with thread - delivery. */ - pthread_mutex_lock (&__active_timer_sigev_thread_lock); - newp->next = __active_timer_sigev_thread; - __active_timer_sigev_thread = newp; - pthread_mutex_unlock (&__active_timer_sigev_thread_lock); - - *timerid = (timer_t) newp; - return 0; - } - - /* Free the resources. */ - free (newp); - - __set_errno (INTERNAL_SYSCALL_ERRNO (res, err)); - - return -1; - } - } - } - -# ifndef __ASSUME_POSIX_TIMERS - /* Compatibility code. */ - return compat_timer_create (clock_id, evp, timerid); -# endif + } + + struct timer *newp; + newp = (struct timer *) malloc (sizeof (struct timer)); + if (newp == NULL) + return -1; + + /* Copy the thread parameters the user provided. */ + newp->sival = evp->sigev_value; + newp->thrfunc = evp->sigev_notify_function; + newp->sigev_notify = SIGEV_THREAD; + + /* We cannot simply copy the thread attributes since the + implementation might keep internal information for + each instance. */ + (void) pthread_attr_init (&newp->attr); + if (evp->sigev_notify_attributes != NULL) + { + struct pthread_attr *nattr; + struct pthread_attr *oattr; + + nattr = (struct pthread_attr *) &newp->attr; + oattr = (struct pthread_attr *) evp->sigev_notify_attributes; + + nattr->schedparam = oattr->schedparam; + nattr->schedpolicy = oattr->schedpolicy; + nattr->flags = oattr->flags; + nattr->guardsize = oattr->guardsize; + nattr->stackaddr = oattr->stackaddr; + nattr->stacksize = oattr->stacksize; + } + + /* In any case set the detach flag. */ + (void) pthread_attr_setdetachstate (&newp->attr, + PTHREAD_CREATE_DETACHED); + + /* Create the event structure for the kernel timer. */ + struct sigevent sev = + { .sigev_value.sival_ptr = newp, + .sigev_signo = SIGTIMER, + .sigev_notify = SIGEV_SIGNAL | SIGEV_THREAD_ID, + ._sigev_un = { ._pad = { [0] = __helper_tid } } }; + + /* Create the timer. */ + INTERNAL_SYSCALL_DECL (err); + int res; + res = INTERNAL_SYSCALL (timer_create, err, 3, + syscall_clockid, &sev, &newp->ktimerid); + if (! INTERNAL_SYSCALL_ERROR_P (res, err)) + { + /* Add to the queue of active timers with thread + delivery. */ + pthread_mutex_lock (&__active_timer_sigev_thread_lock); + newp->next = __active_timer_sigev_thread; + __active_timer_sigev_thread = newp; + pthread_mutex_unlock (&__active_timer_sigev_thread_lock); + + *timerid = (timer_t) newp; + return 0; + } + + /* Free the resources. */ + free (newp); + + __set_errno (INTERNAL_SYSCALL_ERRNO (res, err)); + + return -1; + } + } } -#else -# ifdef timer_create_alias -# define timer_create timer_create_alias -# endif -/* The new system calls are not available. Use the userlevel - implementation. */ -# include <nptl/sysdeps/pthread/timer_create.c> -#endif |