diff options
Diffstat (limited to 'nptl/pthread_mutex_init.c')
| -rw-r--r-- | nptl/pthread_mutex_init.c | 28 |
1 files changed, 24 insertions, 4 deletions
diff --git a/nptl/pthread_mutex_init.c b/nptl/pthread_mutex_init.c index c3f9c2d1c0..6ceca86052 100644 --- a/nptl/pthread_mutex_init.c +++ b/nptl/pthread_mutex_init.c @@ -29,6 +29,11 @@ static const struct pthread_mutexattr default_attr = }; +#ifndef __ASSUME_FUTEX_LOCK_PI +static int tpi_supported; +#endif + + int __pthread_mutex_init (mutex, mutexattr) pthread_mutex_t *mutex; @@ -41,8 +46,7 @@ __pthread_mutex_init (mutex, mutexattr) imutexattr = (const struct pthread_mutexattr *) mutexattr ?: &default_attr; /* Sanity checks. */ - // XXX For now we don't support priority inherited or priority protected - // XXX mutexes. + // XXX For now we don't support priority protected mutexes. switch (__builtin_expect (imutexattr->mutexkind & PTHREAD_MUTEXATTR_PROTOCOL_MASK, PTHREAD_PRIO_NONE @@ -51,6 +55,22 @@ __pthread_mutex_init (mutex, mutexattr) case PTHREAD_PRIO_NONE << PTHREAD_MUTEXATTR_PROTOCOL_SHIFT: break; + case PTHREAD_PRIO_INHERIT << PTHREAD_MUTEXATTR_PROTOCOL_SHIFT: +#ifndef __ASSUME_FUTEX_LOCK_PI + if (__builtin_expect (tpi_supported == 0, 0)) + { + int lock = 0; + INTERNAL_SYSCALL_DECL (err); + int ret = INTERNAL_SYSCALL (futex, err, 4, &lock, FUTEX_UNLOCK_PI, + 0, 0); + assert (INTERNAL_SYSCALL_ERROR_P (ret, err)); + tpi_supported = INTERNAL_SYSCALL_ERRNO (ret, err) == ENOSYS ? -1 : 1; + } + if (__builtin_expect (tpi_supported < 0, 0)) + return ENOTSUP; +#endif + break; + default: return ENOTSUP; } @@ -75,11 +95,11 @@ __pthread_mutex_init (mutex, mutexattr) switch (imutexattr->mutexkind & PTHREAD_MUTEXATTR_PROTOCOL_MASK) { case PTHREAD_PRIO_INHERIT << PTHREAD_MUTEXATTR_PROTOCOL_SHIFT: - mutex->__data.__kind |= PTHREAD_MUTEX_PRIO_INHERIT_PRIVATE_NP; + mutex->__data.__kind |= PTHREAD_MUTEX_PRIO_INHERIT_NP; break; case PTHREAD_PRIO_PROTECT << PTHREAD_MUTEXATTR_PROTOCOL_SHIFT: - mutex->__data.__kind |= PTHREAD_MUTEX_PRIO_PROTECT_PRIVATE_NP; + mutex->__data.__kind |= PTHREAD_MUTEX_PRIO_PROTECT_NP; if (PTHREAD_MUTEX_PRIO_CEILING_MASK == PTHREAD_MUTEXATTR_PRIO_CEILING_MASK) mutex->__data.__kind |= (imutexattr->mutexkind |