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- #include <assert.h>
- #include <errno.h>
- #include <string.h>
- #include <bits/kernel-features.h>
- #include "pthreadP.h"
- static const struct pthread_mutexattr default_attr =
- {
-
- .mutexkind = PTHREAD_MUTEX_NORMAL
- };
- #ifndef __ASSUME_FUTEX_LOCK_PI
- static int tpi_supported;
- #endif
- int
- attribute_protected
- __pthread_mutex_init (
- pthread_mutex_t *mutex,
- const pthread_mutexattr_t *mutexattr)
- {
- const struct pthread_mutexattr *imutexattr;
- assert (sizeof (pthread_mutex_t) <= __SIZEOF_PTHREAD_MUTEX_T);
- imutexattr = (const struct pthread_mutexattr *) mutexattr ?: &default_attr;
-
- switch (__builtin_expect (imutexattr->mutexkind
- & PTHREAD_MUTEXATTR_PROTOCOL_MASK,
- PTHREAD_PRIO_NONE
- << PTHREAD_MUTEXATTR_PROTOCOL_SHIFT))
- {
- 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);
- #if defined(__UCLIBC_USE_TIME64__) && defined(__NR_futex_time64)
- int ret = INTERNAL_SYSCALL (futex_time64, err, 4, &lock, FUTEX_UNLOCK_PI,
- 0, 0);
- #else
- int ret = INTERNAL_SYSCALL (futex, err, 4, &lock, FUTEX_UNLOCK_PI,
- 0, 0);
- #endif
- 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:
-
- if (imutexattr->mutexkind & PTHREAD_MUTEXATTR_FLAG_ROBUST)
- return ENOTSUP;
- break;
- }
-
- memset (mutex, '\0', __SIZEOF_PTHREAD_MUTEX_T);
-
- mutex->__data.__kind = imutexattr->mutexkind & ~PTHREAD_MUTEXATTR_FLAG_BITS;
- if ((imutexattr->mutexkind & PTHREAD_MUTEXATTR_FLAG_ROBUST) != 0)
- {
- #ifndef __ASSUME_SET_ROBUST_LIST
- if ((imutexattr->mutexkind & PTHREAD_MUTEXATTR_FLAG_PSHARED) != 0
- && __set_robust_list_avail < 0)
- return ENOTSUP;
- #endif
- mutex->__data.__kind |= PTHREAD_MUTEX_ROBUST_NORMAL_NP;
- }
- switch (imutexattr->mutexkind & PTHREAD_MUTEXATTR_PROTOCOL_MASK)
- {
- case PTHREAD_PRIO_INHERIT << PTHREAD_MUTEXATTR_PROTOCOL_SHIFT:
- mutex->__data.__kind |= PTHREAD_MUTEX_PRIO_INHERIT_NP;
- break;
- case PTHREAD_PRIO_PROTECT << PTHREAD_MUTEXATTR_PROTOCOL_SHIFT:
- mutex->__data.__kind |= PTHREAD_MUTEX_PRIO_PROTECT_NP;
- int ceiling = (imutexattr->mutexkind
- & PTHREAD_MUTEXATTR_PRIO_CEILING_MASK)
- >> PTHREAD_MUTEXATTR_PRIO_CEILING_SHIFT;
- if (! ceiling)
- {
- if (__sched_fifo_min_prio == -1)
- __init_sched_fifo_prio ();
- if (ceiling < __sched_fifo_min_prio)
- ceiling = __sched_fifo_min_prio;
- }
- mutex->__data.__lock = ceiling << PTHREAD_MUTEX_PRIO_CEILING_SHIFT;
- break;
- default:
- break;
- }
-
- if ((imutexattr->mutexkind & (PTHREAD_MUTEXATTR_FLAG_PSHARED
- | PTHREAD_MUTEXATTR_FLAG_ROBUST)) != 0)
- mutex->__data.__kind |= PTHREAD_MUTEX_PSHARED_BIT;
-
-
-
-
-
-
- return 0;
- }
- strong_alias (__pthread_mutex_init, pthread_mutex_init)
- INTDEF(__pthread_mutex_init)
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