diff options
Diffstat (limited to 'linuxthreads/condvar.c')
| -rw-r--r-- | linuxthreads/condvar.c | 132 |
1 files changed, 45 insertions, 87 deletions
diff --git a/linuxthreads/condvar.c b/linuxthreads/condvar.c index 2dd1e84..6d54291 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 *, struct timespec *); + pthread_mutex_t *, const struct timespec *); static int pthread_cond_timedwait_relative_new(pthread_cond_t *, - pthread_mutex_t *, struct timespec *); + pthread_mutex_t *, const struct timespec *); static int (*pthread_cond_tw_rel)(pthread_cond_t *, pthread_mutex_t *, - struct timespec *) = pthread_cond_timedwait_relative_old; + const struct timespec *) = pthread_cond_timedwait_relative_old; /* initialize this module */ void __pthread_init_condvar(int rt_sig_available) @@ -130,29 +130,15 @@ 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, - struct timespec * reltime) + const struct timespec * abstime) { volatile pthread_descr self = thread_self(); sigset_t unblock, initial_mask; -#ifdef NANOSLEEP_WORKS int already_canceled = 0; int was_signalled = 0; -#else - int retsleep; - int already_canceled; - int was_signalled; -#endif sigjmp_buf jmpbuf; pthread_extricate_if extr; -#ifndef NANOSLEEP_WORKS - requeue_and_wait_again: - - retsleep = 0; - already_canceled = 0; - was_signalled = 0; -#endif - /* Set up extrication interface */ extr.pu_object = cond; extr.pu_extricate_func = cond_extricate_func; @@ -187,22 +173,30 @@ pthread_cond_timedwait_relative_old(pthread_cond_t *cond, sigemptyset(&unblock); sigaddset(&unblock, __pthread_sig_restart); sigprocmask(SIG_UNBLOCK, &unblock, &initial_mask); -#ifdef NANOSLEEP_WORKS - /* Sleep for the required duration. If woken by a signal, resume waiting - as required by Single Unix Specification. */ - while (__libc_nanosleep(reltime, reltime) != 0) - ; -#else - /* Sleep for the required duration */ - retsleep = __libc_nanosleep(reltime, NULL); -#endif + + while (1) { + 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; + } + + /* Sleep for the required duration. If woken by a signal, + resume waiting as required by Single Unix Specification. */ + if (reltime.tv_sec < 0 || __libc_nanosleep(&reltime, NULL) == 0) + break; + } + /* Block the restart signal again */ sigprocmask(SIG_SETMASK, &initial_mask, NULL); was_signalled = 0; } else { -#ifndef NANOSLEEP_WORKS - retsleep = -1; -#endif was_signalled = 1; } THREAD_SETMEM(self, p_signal_jmp, NULL); @@ -234,15 +228,7 @@ pthread_cond_timedwait_relative_old(pthread_cond_t *cond, if (was_on_queue) { __pthread_set_own_extricate_if(self, 0); pthread_mutex_lock(mutex); -#ifdef NANOSLEEP_WORKS return ETIMEDOUT; -#else - if (retsleep == 0) - return ETIMEDOUT; - /* Woken by a signal: resume waiting as required by Single Unix - Specification. */ - goto requeue_and_wait_again; -#endif } suspend(self); @@ -275,28 +261,14 @@ pthread_cond_timedwait_relative_new(pthread_cond_t *cond, { volatile pthread_descr self = thread_self(); sigset_t unblock, initial_mask; -#ifdef NANOSLEEP_WORKS int already_canceled = 0; int was_signalled = 0; -#else - int retsleep; - int already_canceled; - int was_signalled; -#endif sigjmp_buf jmpbuf; pthread_extricate_if extr; already_canceled = 0; was_signalled = 0; -#ifndef NANOSLEEP_WORKS - requeue_and_wait_again: - - retsleep = 0; - already_canceled = 0; - was_signalled = 0; -#endif - /* Set up extrication interface */ extr.pu_object = cond; extr.pu_extricate_func = cond_extricate_func; @@ -330,22 +302,30 @@ pthread_cond_timedwait_relative_new(pthread_cond_t *cond, sigemptyset(&unblock); sigaddset(&unblock, __pthread_sig_restart); sigprocmask(SIG_UNBLOCK, &unblock, &initial_mask); -#ifdef NANOSLEEP_WORKS - /* Sleep for the required duration. If woken by a signal, resume waiting - as required by Single Unix Specification. */ - while (__libc_nanosleep(reltime, reltime) != 0) - ; -#else - /* Sleep for the required duration */ - retsleep = __libc_nanosleep(reltime, NULL); -#endif + + while (1) { + 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; + } + + /* Sleep for the required duration. If woken by a signal, + resume waiting as required by Single Unix Specification. */ + if (reltime.tv_sec < 0 || __libc_nanosleep(&reltime, NULL) == 0) + break; + } + /* Block the restart signal again */ sigprocmask(SIG_SETMASK, &initial_mask, NULL); was_signalled = 0; } else { -#ifndef NANOSLEEP_WORKS - retsleep = -1; -#endif was_signalled = 1; } THREAD_SETMEM(self, p_signal_jmp, NULL); @@ -374,15 +354,7 @@ pthread_cond_timedwait_relative_new(pthread_cond_t *cond, if (was_on_queue) { __pthread_set_own_extricate_if(self, 0); pthread_mutex_lock(mutex); -#ifdef NANOSLEEP_WORKS return ETIMEDOUT; -#else - if (retsleep == 0) - return ETIMEDOUT; - /* Woken by a signal: resume waiting as required by Single Unix - Specification. */ - goto requeue_and_wait_again; -#endif } /* Eat the outstanding restart() from the signaller */ @@ -408,22 +380,8 @@ 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, &reltime); + return pthread_cond_tw_rel(cond, mutex, abstime); } int pthread_cond_signal(pthread_cond_t *cond) |