diff options
Diffstat (limited to 'linuxthreads/condvar.c')
| -rw-r--r-- | linuxthreads/condvar.c | 95 |
1 files changed, 34 insertions, 61 deletions
diff --git a/linuxthreads/condvar.c b/linuxthreads/condvar.c index 5f0e193..c0c6199 100644 --- a/linuxthreads/condvar.c +++ b/linuxthreads/condvar.c @@ -26,13 +26,13 @@ #include "restart.h" static int pthread_cond_timedwait_relative_old(pthread_cond_t *, - pthread_mutex_t *, const struct timespec *); + pthread_mutex_t *, struct timespec *); static int pthread_cond_timedwait_relative_new(pthread_cond_t *, - pthread_mutex_t *, const struct timespec *); + pthread_mutex_t *, struct timespec *); static int (*pthread_cond_tw_rel)(pthread_cond_t *, pthread_mutex_t *, - const struct timespec *) = pthread_cond_timedwait_relative_old; + struct timespec *) = pthread_cond_timedwait_relative_old; /* initialize this module */ void __pthread_init_condvar(int rt_sig_available) @@ -130,32 +130,14 @@ int pthread_cond_wait(pthread_cond_t *cond, pthread_mutex_t *mutex) static int pthread_cond_timedwait_relative_old(pthread_cond_t *cond, pthread_mutex_t *mutex, - const struct timespec * abstime) + struct timespec * reltime) { volatile pthread_descr self = thread_self(); sigset_t unblock, initial_mask; - int retsleep, already_canceled, was_signalled; + int already_canceled = 0; + int was_signalled = 0; sigjmp_buf jmpbuf; pthread_extricate_if extr; - struct timeval now; - struct timespec reltime; - -requeue_and_wait_again: - - /* Compute a time offset relative to now. */ - __gettimeofday (&now, NULL); - reltime.tv_nsec = abstime->tv_nsec - now.tv_usec * 1000; - reltime.tv_sec = abstime->tv_sec - now.tv_sec; - if (reltime.tv_nsec < 0) { - reltime.tv_nsec += 1000000000; - reltime.tv_sec -= 1; - } - if (reltime.tv_sec < 0) - return ETIMEDOUT; - - retsleep = 0; - already_canceled = 0; - was_signalled = 0; /* Set up extrication interface */ extr.pu_object = cond; @@ -191,13 +173,14 @@ requeue_and_wait_again: sigemptyset(&unblock); sigaddset(&unblock, __pthread_sig_restart); sigprocmask(SIG_UNBLOCK, &unblock, &initial_mask); - /* Sleep for the required duration */ - retsleep = __libc_nanosleep(&reltime, NULL); + /* Sleep for the required duration. If woken by a signal, resume waiting + as required by Single Unix Specification. */ + while (__libc_nanosleep(reltime, reltime) != 0) + ; /* Block the restart signal again */ sigprocmask(SIG_SETMASK, &initial_mask, NULL); was_signalled = 0; } else { - retsleep = -1; was_signalled = 1; } THREAD_SETMEM(self, p_signal_jmp, NULL); @@ -229,12 +212,7 @@ requeue_and_wait_again: if (was_on_queue) { __pthread_set_own_extricate_if(self, 0); pthread_mutex_lock(mutex); - - if (retsleep == 0) - return ETIMEDOUT; - /* Woken by a signal: resume waiting as required by Single Unix - Specification. */ - goto requeue_and_wait_again; + return ETIMEDOUT; } suspend(self); @@ -263,30 +241,15 @@ requeue_and_wait_again: static int pthread_cond_timedwait_relative_new(pthread_cond_t *cond, pthread_mutex_t *mutex, - const struct timespec * abstime) + struct timespec * reltime) { volatile pthread_descr self = thread_self(); sigset_t unblock, initial_mask; - int retsleep, already_canceled, was_signalled; + int already_canceled = 0; + int was_signalled = 0; sigjmp_buf jmpbuf; pthread_extricate_if extr; - struct timeval now; - struct timespec reltime; - requeue_and_wait_again: - - /* Compute a time offset relative to now. */ - __gettimeofday (&now, NULL); - reltime.tv_nsec = abstime->tv_nsec - now.tv_usec * 1000; - reltime.tv_sec = abstime->tv_sec - now.tv_sec; - if (reltime.tv_nsec < 0) { - reltime.tv_nsec += 1000000000; - reltime.tv_sec -= 1; - } - if (reltime.tv_sec < 0) - return ETIMEDOUT; - - retsleep = 0; already_canceled = 0; was_signalled = 0; @@ -323,13 +286,14 @@ pthread_cond_timedwait_relative_new(pthread_cond_t *cond, sigemptyset(&unblock); sigaddset(&unblock, __pthread_sig_restart); sigprocmask(SIG_UNBLOCK, &unblock, &initial_mask); - /* Sleep for the required duration */ - retsleep = __libc_nanosleep(&reltime, NULL); + /* Sleep for the required duration. If woken by a signal, resume waiting + as required by Single Unix Specification. */ + while (__libc_nanosleep(reltime, reltime) != 0) + ; /* Block the restart signal again */ sigprocmask(SIG_SETMASK, &initial_mask, NULL); was_signalled = 0; } else { - retsleep = -1; was_signalled = 1; } THREAD_SETMEM(self, p_signal_jmp, NULL); @@ -358,12 +322,7 @@ pthread_cond_timedwait_relative_new(pthread_cond_t *cond, if (was_on_queue) { __pthread_set_own_extricate_if(self, 0); pthread_mutex_lock(mutex); - - if (retsleep == 0) - return ETIMEDOUT; - /* Woken by a signal: resume waiting as required by Single Unix - Specification. */ - goto requeue_and_wait_again; + return ETIMEDOUT; } /* Eat the outstanding restart() from the signaller */ @@ -389,8 +348,22 @@ pthread_cond_timedwait_relative_new(pthread_cond_t *cond, int pthread_cond_timedwait(pthread_cond_t *cond, pthread_mutex_t *mutex, const struct timespec * abstime) { + struct timeval now; + struct timespec reltime; + + /* Compute a time offset relative to now. */ + __gettimeofday (&now, NULL); + reltime.tv_nsec = abstime->tv_nsec - now.tv_usec * 1000; + reltime.tv_sec = abstime->tv_sec - now.tv_sec; + if (reltime.tv_nsec < 0) { + reltime.tv_nsec += 1000000000; + reltime.tv_sec -= 1; + } + if (reltime.tv_sec < 0) + return ETIMEDOUT; + /* Indirect call through pointer! */ - return pthread_cond_tw_rel(cond, mutex, abstime); + return pthread_cond_tw_rel(cond, mutex, &reltime); } int pthread_cond_signal(pthread_cond_t *cond) |