From a311086d622d3c778e1da57cfae167c0ab1c0fb4 Mon Sep 17 00:00:00 2001 From: rpj Date: Sun, 1 Jul 2001 13:23:10 +0000 Subject: 2001-06-25 Ross Johnson * create.c (pthread_create): Add priority inheritance attributes. * mutex.c (pthread_mutex_lock): Remove some overhead for PTHREAD_MUTEX_NORMAL mutex types. Specifically, avoid calling pthread_self() and pthread_equal() to check/set the mutex owner. Introduce a new pseudo owner for this type. Test results suggest increases in speed of up to 90% for non-blocking locks. This is the default type of mutex used internally by other synchronising objects, ie. condition variables and read-write locks. The test rwlock7.c shows about a 30-35% speed increase over snapshot 2001-06-06. The price of this is that the application developer must ensure correct behaviour, or explicitly set the mutex to a safer type such as PTHREAD_MUTEX_ERRORCHECK. For example, PTHREAD_MUTEX_NORMAL (or PTHREAD_MUTEX_DEFAULT) type mutexes will not return an error if a thread which is not the owner calls pthread_mutex_unlock. The call will succeed in unlocking the mutex if it is currently locked, but a subsequent unlock by the true owner will then fail with EPERM. This is however consistent with some other implementations. (pthread_mutex_unlock): Likewise. (pthread_mutex_trylock): Likewise. (pthread_mutex_destroy): Likewise. * attr.c (pthread_attr_init): PTHREAD_EXPLICIT_SCHED is the default inheritance attribute; THREAD_PRIORITY_NORMAL is the default priority for new threads. * sched.c (pthread_attr_setschedpolicy): Added routine. (pthread_attr_getschedpolicy): Added routine. (pthread_attr_setinheritsched): Added routine. (pthread_attr_getinheritsched): Added routine. * pthread.h (sched_rr_set_interval): Added as a macro; returns -1 with errno set to ENOSYS. 2001-06-23 Ross Johnson *sched.c (pthread_attr_setschedparam): Add priority range check. (sched_setscheduler): New function; checks for a valid pid and policy; checks for permission to set information in the target process; expects pid to be a Win32 process ID, not a process handle; the only scheduler policy allowed is SCHED_OTHER. (sched_getscheduler): Likewise, but checks for permission to query. * pthread.h (SCHED_*): Moved to sched.h as defined in the POSIX standard. * sched.h (SCHED_*): Moved from pthread.h. (pid_t): Defined if necessary. (sched_setscheduler): Defined. (sched_getscheduler): Defined. * pthread.def (sched_setscheduler): Exported. (sched_getscheduler): Likewise. 2001-06-23 Ross Johnson Contributed by - Ralf Brese * create.c (pthread_create): Set thread priority from thread attributes. --- tests/mutex5.c | 18 +++++++++--------- 1 file changed, 9 insertions(+), 9 deletions(-) (limited to 'tests/mutex5.c') diff --git a/tests/mutex5.c b/tests/mutex5.c index d7b9064..1f90e19 100644 --- a/tests/mutex5.c +++ b/tests/mutex5.c @@ -13,18 +13,18 @@ int main() { int mxType = -1; - int bool = 0; /* Use to quell GNU compiler warnings. */ + int success = 0; /* Use to quell GNU compiler warnings. */ - assert(bool = PTHREAD_MUTEX_DEFAULT == PTHREAD_MUTEX_NORMAL); - assert(bool = PTHREAD_MUTEX_DEFAULT != PTHREAD_MUTEX_ERRORCHECK); - assert(bool = PTHREAD_MUTEX_DEFAULT != PTHREAD_MUTEX_RECURSIVE); - assert(bool = PTHREAD_MUTEX_RECURSIVE != PTHREAD_MUTEX_ERRORCHECK); + assert(success = PTHREAD_MUTEX_DEFAULT == PTHREAD_MUTEX_NORMAL); + assert(success = PTHREAD_MUTEX_DEFAULT != PTHREAD_MUTEX_ERRORCHECK); + assert(success = PTHREAD_MUTEX_DEFAULT != PTHREAD_MUTEX_RECURSIVE); + assert(success = PTHREAD_MUTEX_RECURSIVE != PTHREAD_MUTEX_ERRORCHECK); - assert(bool = PTHREAD_MUTEX_NORMAL == PTHREAD_MUTEX_FAST_NP); - assert(bool = PTHREAD_MUTEX_RECURSIVE == PTHREAD_MUTEX_RECURSIVE_NP); - assert(bool = PTHREAD_MUTEX_ERRORCHECK == PTHREAD_MUTEX_ERRORCHECK_NP); + assert(success = PTHREAD_MUTEX_NORMAL == PTHREAD_MUTEX_FAST_NP); + assert(success = PTHREAD_MUTEX_RECURSIVE == PTHREAD_MUTEX_RECURSIVE_NP); + assert(success = PTHREAD_MUTEX_ERRORCHECK == PTHREAD_MUTEX_ERRORCHECK_NP); - if (bool == bool) + if (success == success) { assert(pthread_mutexattr_init(&mxAttr) == 0); assert(pthread_mutexattr_gettype(&mxAttr, &mxType) == 0); -- cgit v1.2.3