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bionic: pthread: use private futexes by default for mutexes and condvars

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Private futexes are a recent kernel addition: faster futexes that cannot be
shared between processes. This patch uses them by default, unless the PROCESS_SHARED
attribute flag is used when creating a mutex and/or conditional variable.

Also introduces pthread_condattr_init/destroy/setpshared/getpshared.

Change-Id: I3a0e2116f467072b046524cb5babc00e41057a53
This commit is contained in:
David 'Digit' Turner
2010-03-10 16:44:08 -08:00
parent 1cfbda826c
commit ba9c6f0989
6 changed files with 612 additions and 299 deletions
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5
libc/include/pthread.h
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@@ -165,6 +165,11 @@ int pthread_mutex_unlock(pthread_mutex_t *mutex);
int pthread_mutex_trylock(pthread_mutex_t *mutex);
int pthread_mutex_timedlock(pthread_mutex_t *mutex, struct timespec* ts);
int pthread_condattr_init(pthread_condattr_t *attr);
int pthread_condattr_setpshared(pthread_condattr_t *attr, int pshared);
int pthread_condattr_getpshared(pthread_condattr_t *attr, int *pshared);
int pthread_condattr_destroy(pthread_condattr_t *attr);
int pthread_cond_init(pthread_cond_t *cond,
const pthread_condattr_t *attr);
int pthread_cond_destroy(pthread_cond_t *cond);