diff options
| -rw-r--r-- | ChangeLog | 13 | ||||
| -rw-r--r-- | nptl/sysdeps/unix/sysv/linux/pthread_once.c | 131 | ||||
| -rw-r--r-- | nptl/sysdeps/unix/sysv/linux/sparc/pthread_once.c | 93 | ||||
| -rw-r--r-- | ports/ChangeLog.hppa | 5 | ||||
| -rw-r--r-- | ports/sysdeps/unix/sysv/linux/hppa/nptl/pthread_once.c | 93 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/aarch64/nptl/pthread_once.c | 90 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/arm/nptl/pthread_once.c | 89 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/ia64/nptl/pthread_once.c | 93 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/m68k/nptl/pthread_once.c | 90 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/mips/nptl/pthread_once.c | 93 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/tile/nptl/pthread_once.c | 94 |
11 files changed, 149 insertions, 735 deletions
diff --git a/ChangeLog b/ChangeLog index 5708d4eb64..0fdc6b5a57 100644 --- a/ChangeLog +++ b/ChangeLog @@ -1,3 +1,16 @@ +2014-04-11 Torvald Riegel <triegel@redhat.com> + + [BZ #15215] + * nptl/sysdeps/unix/sysv/linux/sparc/pthread_once.c: Moved to ... + * nptl/sysdeps/unix/sysv/linux/pthread_once.c: ... here. Add missing + memory barriers. Add comments. + * sysdeps/unix/sysv/linux/aarch64/nptl/pthread_once.c: Remove file. + * sysdeps/unix/sysv/linux/arm/nptl/pthread_once.c: Remove file. + * sysdeps/unix/sysv/linux/ia64/nptl/pthread_once.c: Remove file. + * sysdeps/unix/sysv/linux/m68k/nptl/pthread_once.c: Remove file. + * sysdeps/unix/sysv/linux/mips/nptl/pthread_once.c: Remove file. + * sysdeps/unix/sysv/linux/tile/nptl/pthread_once.c: Remove file. + 2014-04-11 Stefan Liebler <stli@linux.vnet.ibm.com> * sysdeps/s390/s390-32/configure.ac: Unify file with ... diff --git a/nptl/sysdeps/unix/sysv/linux/pthread_once.c b/nptl/sysdeps/unix/sysv/linux/pthread_once.c new file mode 100644 index 0000000000..10c01d6023 --- /dev/null +++ b/nptl/sysdeps/unix/sysv/linux/pthread_once.c @@ -0,0 +1,131 @@ +/* Copyright (C) 2003-2014 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Jakub Jelinek <jakub@redhat.com>, 2003. + + 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 "pthreadP.h" +#include <lowlevellock.h> +#include <atomic.h> + + +unsigned long int __fork_generation attribute_hidden; + + +static void +clear_once_control (void *arg) +{ + pthread_once_t *once_control = (pthread_once_t *) arg; + + /* Reset to the uninitialized state here. We don't need a stronger memory + order because we do not need to make any other of our writes visible to + other threads that see this value: This function will be called if we + get interrupted (see __pthread_once), so all we need to relay to other + threads is the state being reset again. */ + *once_control = 0; + lll_futex_wake (once_control, INT_MAX, LLL_PRIVATE); +} + + +/* This is similar to a lock implementation, but we distinguish between three + states: not yet initialized (0), initialization finished (2), and + initialization in progress (__fork_generation | 1). If in the first state, + threads will try to run the initialization by moving to the second state; + the first thread to do so via a CAS on once_control runs init_routine, + other threads block. + When forking the process, some threads can be interrupted during the second + state; they won't be present in the forked child, so we need to restart + initialization in the child. To distinguish an in-progress initialization + from an interrupted initialization (in which case we need to reclaim the + lock), we look at the fork generation that's part of the second state: We + can reclaim iff it differs from the current fork generation. + XXX: This algorithm has an ABA issue on the fork generation: If an + initialization is interrupted, we then fork 2^30 times (30 bits of + once_control are used for the fork generation), and try to initialize + again, we can deadlock because we can't distinguish the in-progress and + interrupted cases anymore. */ +int +__pthread_once (once_control, init_routine) + pthread_once_t *once_control; + void (*init_routine) (void); +{ + while (1) + { + int oldval, val, newval; + + /* We need acquire memory order for this load because if the value + signals that initialization has finished, we need to be see any + data modifications done during initialization. */ + val = *once_control; + atomic_read_barrier(); + do + { + /* Check if the initialization has already been done. */ + if (__glibc_likely ((val & 2) != 0)) + return 0; + + oldval = val; + /* We try to set the state to in-progress and having the current + fork generation. We don't need atomic accesses for the fork + generation because it's immutable in a particular process, and + forked child processes start with a single thread that modified + the generation. */ + newval = __fork_generation | 1; + /* We need acquire memory order here for the same reason as for the + load from once_control above. */ + val = atomic_compare_and_exchange_val_acq (once_control, newval, + oldval); + } + while (__glibc_unlikely (val != oldval)); + + /* Check if another thread already runs the initializer. */ + if ((oldval & 1) != 0) + { + /* Check whether the initializer execution was interrupted by a + fork. We know that for both values, bit 0 is set and bit 1 is + not. */ + if (oldval == newval) + { + /* Same generation, some other thread was faster. Wait. */ + lll_futex_wait (once_control, newval, LLL_PRIVATE); + continue; + } + } + + /* This thread is the first here. Do the initialization. + Register a cleanup handler so that in case the thread gets + interrupted the initialization can be restarted. */ + pthread_cleanup_push (clear_once_control, once_control); + + init_routine (); + + pthread_cleanup_pop (0); + + + /* Mark *once_control as having finished the initialization. We need + release memory order here because we need to synchronize with other + threads that want to use the initialized data. */ + atomic_write_barrier(); + *once_control = 2; + + /* Wake up all other threads. */ + lll_futex_wake (once_control, INT_MAX, LLL_PRIVATE); + break; + } + + return 0; +} +weak_alias (__pthread_once, pthread_once) +hidden_def (__pthread_once) diff --git a/nptl/sysdeps/unix/sysv/linux/sparc/pthread_once.c b/nptl/sysdeps/unix/sysv/linux/sparc/pthread_once.c deleted file mode 100644 index a231e55879..0000000000 --- a/nptl/sysdeps/unix/sysv/linux/sparc/pthread_once.c +++ /dev/null @@ -1,93 +0,0 @@ -/* Copyright (C) 2003-2014 Free Software Foundation, Inc. - This file is part of the GNU C Library. - Contributed by Jakub Jelinek <jakub@redhat.com>, 2003. - - 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 "pthreadP.h" -#include <lowlevellock.h> - - -unsigned long int __fork_generation attribute_hidden; - - -static void -clear_once_control (void *arg) -{ - pthread_once_t *once_control = (pthread_once_t *) arg; - - *once_control = 0; - lll_futex_wake (once_control, INT_MAX, LLL_PRIVATE); -} - - -int -__pthread_once (once_control, init_routine) - pthread_once_t *once_control; - void (*init_routine) (void); -{ - while (1) - { - int oldval, val, newval; - - val = *once_control; - do - { - /* Check if the initialized has already been done. */ - if ((val & 2) != 0) - return 0; - - oldval = val; - newval = (oldval & 3) | __fork_generation | 1; - val = atomic_compare_and_exchange_val_acq (once_control, newval, - oldval); - } - while (__builtin_expect (val != oldval, 0)); - - /* Check if another thread already runs the initializer. */ - if ((oldval & 1) != 0) - { - /* Check whether the initializer execution was interrupted - by a fork. */ - if (((oldval ^ newval) & -4) == 0) - { - /* Same generation, some other thread was faster. Wait. */ - lll_futex_wait (once_control, newval, LLL_PRIVATE); - continue; - } - } - - /* This thread is the first here. Do the initialization. - Register a cleanup handler so that in case the thread gets - interrupted the initialization can be restarted. */ - pthread_cleanup_push (clear_once_control, once_control); - - init_routine (); - - pthread_cleanup_pop (0); - - - /* Add one to *once_control. */ - atomic_increment (once_control); - - /* Wake up all other threads. */ - lll_futex_wake (once_control, INT_MAX, LLL_PRIVATE); - break; - } - - return 0; -} -weak_alias (__pthread_once, pthread_once) -hidden_def (__pthread_once) diff --git a/ports/ChangeLog.hppa b/ports/ChangeLog.hppa index 39c77018a8..3efd186109 100644 --- a/ports/ChangeLog.hppa +++ b/ports/ChangeLog.hppa @@ -1,3 +1,8 @@ +2014-04-11 Torvald Riegel <triegel@redhat.com> + + [BZ #15215] + * sysdeps/unix/sysv/linux/hppa/nptl/pthread_once.c: Remove file. + 2014-04-09 Adhemerval Zanella <azanella@linux.vnet.ibm.com> * ports/sysdeps/unix/sysv/linux/hppa/nptl/bits/pthreadtypes.h diff --git a/ports/sysdeps/unix/sysv/linux/hppa/nptl/pthread_once.c b/ports/sysdeps/unix/sysv/linux/hppa/nptl/pthread_once.c deleted file mode 100644 index ee6b496e4f..0000000000 --- a/ports/sysdeps/unix/sysv/linux/hppa/nptl/pthread_once.c +++ /dev/null @@ -1,93 +0,0 @@ -/* Copyright (C) 2003-2014 Free Software Foundation, Inc. - This file is part of the GNU C Library. - Contributed by Jakub Jelinek <jakub@redhat.com>, 2003. - - 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 "pthreadP.h" -#include <lowlevellock.h> - - -unsigned long int __fork_generation attribute_hidden; - - -static void -clear_once_control (void *arg) -{ - pthread_once_t *once_control = (pthread_once_t *) arg; - - *once_control = 0; - lll_private_futex_wake (once_control, INT_MAX); -} - - -int -__pthread_once (once_control, init_routine) - pthread_once_t *once_control; - void (*init_routine) (void); -{ - while (1) - { - int oldval, val, newval; - - val = *once_control; - do - { - /* Check if the initialized has already been done. */ - if ((val & 2) != 0) - return 0; - - oldval = val; - newval = (oldval & 3) | __fork_generation | 1; - val = atomic_compare_and_exchange_val_acq (once_control, newval, - oldval); - } - while (__builtin_expect (val != oldval, 0)); - - /* Check if another thread already runs the initializer. */ - if ((oldval & 1) != 0) - { - /* Check whether the initializer execution was interrupted - by a fork. */ - if (((oldval ^ newval) & -4) == 0) - { - /* Same generation, some other thread was faster. Wait. */ - lll_private_futex_wait (once_control, newval); - continue; - } - } - - /* This thread is the first here. Do the initialization. - Register a cleanup handler so that in case the thread gets - interrupted the initialization can be restarted. */ - pthread_cleanup_push (clear_once_control, once_control); - - init_routine (); - - pthread_cleanup_pop (0); - - - /* Add one to *once_control. */ - atomic_increment (once_control); - - /* Wake up all other threads. */ - lll_private_futex_wake (once_control, INT_MAX); - break; - } - - return 0; -} -weak_alias (__pthread_once, pthread_once) -hidden_def (__pthread_once) diff --git a/sysdeps/unix/sysv/linux/aarch64/nptl/pthread_once.c b/sysdeps/unix/sysv/linux/aarch64/nptl/pthread_once.c deleted file mode 100644 index d1b28ff51f..0000000000 --- a/sysdeps/unix/sysv/linux/aarch64/nptl/pthread_once.c +++ /dev/null @@ -1,90 +0,0 @@ -/* Copyright (C) 2004-2014 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 "pthreadP.h" -#include <lowlevellock.h> - -unsigned long int __fork_generation attribute_hidden; - -static void -clear_once_control (void *arg) -{ - pthread_once_t *once_control = (pthread_once_t *) arg; - - *once_control = 0; - lll_futex_wake (once_control, INT_MAX, LLL_PRIVATE); -} - -int -__pthread_once (pthread_once_t *once_control, void (*init_routine) (void)) -{ - for (;;) - { - int oldval; - int newval; - - /* Pseudo code: - newval = __fork_generation | 1; - oldval = *once_control; - if ((oldval & 2) == 0) - *once_control = newval; - Do this atomically. - */ - do - { - newval = __fork_generation | 1; - oldval = *once_control; - if (oldval & 2) - break; - } while (atomic_compare_and_exchange_val_acq (once_control, newval, oldval) != oldval); - - /* Check if the initializer has already been done. */ - if ((oldval & 2) != 0) - return 0; - - /* Check if another thread already runs the initializer. */ - if ((oldval & 1) == 0) - break; - - /* Check whether the initializer execution was interrupted by a fork. */ - if (oldval != newval) - break; - - /* Same generation, some other thread was faster. Wait. */ - lll_futex_wait (once_control, oldval, LLL_PRIVATE); - } - - /* This thread is the first here. Do the initialization. - Register a cleanup handler so that in case the thread gets - interrupted the initialization can be restarted. */ - pthread_cleanup_push (clear_once_control, once_control); - - init_routine (); - - pthread_cleanup_pop (0); - - /* Say that the initialisation is done. */ - *once_control = __fork_generation | 2; - - /* Wake up all other threads. */ - lll_futex_wake (once_control, INT_MAX, LLL_PRIVATE); - - return 0; -} -weak_alias (__pthread_once, pthread_once) -hidden_def (__pthread_once) diff --git a/sysdeps/unix/sysv/linux/arm/nptl/pthread_once.c b/sysdeps/unix/sysv/linux/arm/nptl/pthread_once.c deleted file mode 100644 index a063149925..0000000000 --- a/sysdeps/unix/sysv/linux/arm/nptl/pthread_once.c +++ /dev/null @@ -1,89 +0,0 @@ -/* Copyright (C) 2004-2014 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 "pthreadP.h" -#include <lowlevellock.h> - -unsigned long int __fork_generation attribute_hidden; - -static void -clear_once_control (void *arg) -{ - pthread_once_t *once_control = (pthread_once_t *) arg; - - *once_control = 0; - lll_futex_wake (once_control, INT_MAX, LLL_PRIVATE); -} - -int -__pthread_once (pthread_once_t *once_control, void (*init_routine) (void)) -{ - for (;;) - { - int oldval; - int newval; - - /* Pseudo code: - newval = __fork_generation | 1; - oldval = *once_control; - if ((oldval & 2) == 0) - *once_control = newval; - Do this atomically. - */ - do - { - newval = __fork_generation | 1; - oldval = *once_control; - if (oldval & 2) - break; - } while (atomic_compare_and_exchange_val_acq (once_control, newval, oldval) != oldval); - - /* Check if the initializer has already been done. */ - if ((oldval & 2) != 0) - return 0; - - /* Check if another thread already runs the initializer. */ - if ((oldval & 1) == 0) - break; - - /* Check whether the initializer execution was interrupted by a fork. */ - if (oldval != newval) - break; - - /* Same generation, some other thread was faster. Wait. */ - lll_futex_wait (once_control, oldval, LLL_PRIVATE); - } - - /* This thread is the first here. Do the initialization. - Register a cleanup handler so that in case the thread gets - interrupted the initialization can be restarted. */ - pthread_cleanup_push (clear_once_control, once_control); - - init_routine (); - - pthread_cleanup_pop (0); - - /* Say that the initialisation is done. */ - *once_control = __fork_generation | 2; - - /* Wake up all other threads. */ - lll_futex_wake (once_control, INT_MAX, LLL_PRIVATE); - - return 0; -} -weak_alias (__pthread_once, pthread_once) -hidden_def (__pthread_once) diff --git a/sysdeps/unix/sysv/linux/ia64/nptl/pthread_once.c b/sysdeps/unix/sysv/linux/ia64/nptl/pthread_once.c deleted file mode 100644 index a231e55879..0000000000 --- a/sysdeps/unix/sysv/linux/ia64/nptl/pthread_once.c +++ /dev/null @@ -1,93 +0,0 @@ -/* Copyright (C) 2003-2014 Free Software Foundation, Inc. - This file is part of the GNU C Library. - Contributed by Jakub Jelinek <jakub@redhat.com>, 2003. - - 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 "pthreadP.h" -#include <lowlevellock.h> - - -unsigned long int __fork_generation attribute_hidden; - - -static void -clear_once_control (void *arg) -{ - pthread_once_t *once_control = (pthread_once_t *) arg; - - *once_control = 0; - lll_futex_wake (once_control, INT_MAX, LLL_PRIVATE); -} - - -int -__pthread_once (once_control, init_routine) - pthread_once_t *once_control; - void (*init_routine) (void); -{ - while (1) - { - int oldval, val, newval; - - val = *once_control; - do - { - /* Check if the initialized has already been done. */ - if ((val & 2) != 0) - return 0; - - oldval = val; - newval = (oldval & 3) | __fork_generation | 1; - val = atomic_compare_and_exchange_val_acq (once_control, newval, - oldval); - } - while (__builtin_expect (val != oldval, 0)); - - /* Check if another thread already runs the initializer. */ - if ((oldval & 1) != 0) - { - /* Check whether the initializer execution was interrupted - by a fork. */ - if (((oldval ^ newval) & -4) == 0) - { - /* Same generation, some other thread was faster. Wait. */ - lll_futex_wait (once_control, newval, LLL_PRIVATE); - continue; - } - } - - /* This thread is the first here. Do the initialization. - Register a cleanup handler so that in case the thread gets - interrupted the initialization can be restarted. */ - pthread_cleanup_push (clear_once_control, once_control); - - init_routine (); - - pthread_cleanup_pop (0); - - - /* Add one to *once_control. */ - atomic_increment (once_control); - - /* Wake up all other threads. */ - lll_futex_wake (once_control, INT_MAX, LLL_PRIVATE); - break; - } - - return 0; -} -weak_alias (__pthread_once, pthread_once) -hidden_def (__pthread_once) diff --git a/sysdeps/unix/sysv/linux/m68k/nptl/pthread_once.c b/sysdeps/unix/sysv/linux/m68k/nptl/pthread_once.c deleted file mode 100644 index 01542e9c74..0000000000 --- a/sysdeps/unix/sysv/linux/m68k/nptl/pthread_once.c +++ /dev/null @@ -1,90 +0,0 @@ -/* Copyright (C) 2010-2014 Free Software Foundation, Inc. - This file is part of the GNU C Library. - Contributed by Maxim Kuvyrkov <maxim@codesourcery.com>, 2010. - - 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 "pthreadP.h" -#include <lowlevellock.h> - -unsigned long int __fork_generation attribute_hidden; - -static void -clear_once_control (void *arg) -{ - pthread_once_t *once_control = (pthread_once_t *) arg; - - *once_control = 0; - lll_futex_wake (once_control, INT_MAX, LLL_PRIVATE); -} - -int -__pthread_once (pthread_once_t *once_control, void (*init_routine) (void)) -{ - for (;;) - { - int oldval; - int newval; - - /* Pseudo code: - newval = __fork_generation | 1; - oldval = *once_control; - if ((oldval & 2) == 0) - *once_control = newval; - Do this atomically. - */ - do - { - newval = __fork_generation | 1; - oldval = *once_control; - if (oldval & 2) - break; - } while (atomic_compare_and_exchange_val_acq (once_control, newval, oldval) != oldval); - - /* Check if the initializer has already been done. */ - if ((oldval & 2) != 0) - return 0; - - /* Check if another thread already runs the initializer. */ - if ((oldval & 1) == 0) - break; - - /* Check whether the initializer execution was interrupted by a fork. */ - if (oldval != newval) - break; - - /* Same generation, some other thread was faster. Wait. */ - lll_futex_wait (once_control, oldval, LLL_PRIVATE); - } - - /* This thread is the first here. Do the initialization. - Register a cleanup handler so that in case the thread gets - interrupted the initialization can be restarted. */ - pthread_cleanup_push (clear_once_control, once_control); - - init_routine (); - - pthread_cleanup_pop (0); - - /* Say that the initialisation is done. */ - *once_control = __fork_generation | 2; - - /* Wake up all other threads. */ - lll_futex_wake (once_control, INT_MAX, LLL_PRIVATE); - - return 0; -} -weak_alias (__pthread_once, pthread_once) -hidden_def (__pthread_once) diff --git a/sysdeps/unix/sysv/linux/mips/nptl/pthread_once.c b/sysdeps/unix/sysv/linux/mips/nptl/pthread_once.c deleted file mode 100644 index 3e3430dbc6..0000000000 --- a/sysdeps/unix/sysv/linux/mips/nptl/pthread_once.c +++ /dev/null @@ -1,93 +0,0 @@ -/* Copyright (C) 2003-2014 Free Software Foundation, Inc. - This file is part of the GNU C Library. - Contributed by Jakub Jelinek <jakub@redhat.com>, 2003. - - 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 "pthreadP.h" -#include <lowlevellock.h> - - -unsigned long int __fork_generation attribute_hidden; - - -static void -clear_once_control (void *arg) -{ - pthread_once_t *once_control = (pthread_once_t *) arg; - - *once_control = 0; - lll_futex_wake (once_control, INT_MAX, LLL_PRIVATE); -} - - -int -__pthread_once (once_control, init_routine) - pthread_once_t *once_control; - void (*init_routine) (void); -{ - while (1) - { - int oldval, val, newval; - - val = *once_control; - do - { - /* Check if the initialized has already been done. */ - if ((val & 2) != 0) - return 0; - - oldval = val; - newval = (oldval & 3) | __fork_generation | 1; - val = atomic_compare_and_exchange_val_acq (once_control, newval, - oldval); - } - while (__builtin_expect (val != oldval, 0)); - - /* Check if another thread already runs the initializer. */ - if ((oldval & 1) != 0) - { - /* Check whether the initializer execution was interrupted - by a fork. */ - if (((oldval ^ newval) & -4) == 0) - { - /* Same generation, some other thread was faster. Wait. */ - lll_futex_wait (once_control, newval, LLL_PRIVATE); - continue; - } - } - - /* This thread is the first here. Do the initialization. - Register a cleanup handler so that in case the thread gets - interrupted the initialization can be restarted. */ - pthread_cleanup_push (clear_once_control, once_control); - - init_routine (); - - pthread_cleanup_pop (0); - - - /* Add one to *once_control. */ - atomic_increment (once_control); - - /* Wake up all other threads. */ - lll_futex_wake (once_control, INT_MAX, LLL_PRIVATE); - break; - } - - return 0; -} -weak_alias (__pthread_once, pthread_once) -hidden_def (__pthread_once) diff --git a/sysdeps/unix/sysv/linux/tile/nptl/pthread_once.c b/sysdeps/unix/sysv/linux/tile/nptl/pthread_once.c deleted file mode 100644 index 1b38999870..0000000000 --- a/sysdeps/unix/sysv/linux/tile/nptl/pthread_once.c +++ /dev/null @@ -1,94 +0,0 @@ -/* Copyright (C) 2011-2014 Free Software Foundation, Inc. - This file is part of the GNU C Library. - Contributed by Chris Metcalf <cmetcalf@tilera.com>, 2011. - Based on work contributed by Jakub Jelinek <jakub@redhat.com>, 2003. - - 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 <nptl/pthreadP.h> -#include <lowlevellock.h> - - -unsigned long int __fork_generation attribute_hidden; - - -static void -clear_once_control (void *arg) -{ - pthread_once_t *once_control = (pthread_once_t *) arg; - - *once_control = 0; - lll_futex_wake (once_control, INT_MAX, LLL_PRIVATE); -} - - -int -__pthread_once (once_control, init_routine) - pthread_once_t *once_control; - void (*init_routine) (void); -{ - while (1) - { - int oldval, val, newval; - - val = *once_control; - do - { - /* Check if the initialized has already been done. */ - if ((val & 2) != 0) - return 0; - - oldval = val; - newval = (oldval & 3) | __fork_generation | 1; - val = atomic_compare_and_exchange_val_acq (once_control, newval, - oldval); - } - while (__builtin_expect (val != oldval, 0)); - - /* Check if another thread already runs the initializer. */ - if ((oldval & 1) != 0) - { - /* Check whether the initializer execution was interrupted - by a fork. */ - if (((oldval ^ newval) & -4) == 0) - { - /* Same generation, some other thread was faster. Wait. */ - lll_futex_wait (once_control, newval, LLL_PRIVATE); - continue; - } - } - - /* This thread is the first here. Do the initialization. - Register a cleanup handler so that in case the thread gets - interrupted the initialization can be restarted. */ - pthread_cleanup_push (clear_once_control, once_control); - - init_routine (); - - pthread_cleanup_pop (0); - - - /* Add one to *once_control. */ - atomic_increment (once_control); - - /* Wake up all other threads. */ - lll_futex_wake (once_control, INT_MAX, LLL_PRIVATE); - break; - } - - return 0; -} -weak_alias (__pthread_once, pthread_once) -hidden_def (__pthread_once) |