diff options
Diffstat (limited to 'nptl/sem_init.c')
| -rw-r--r-- | nptl/sem_init.c | 35 |
1 files changed, 23 insertions, 12 deletions
diff --git a/nptl/sem_init.c b/nptl/sem_init.c index 5350f16a19..575b661f62 100644 --- a/nptl/sem_init.c +++ b/nptl/sem_init.c @@ -18,17 +18,29 @@ #include <errno.h> #include <semaphore.h> -#include <lowlevellock.h> #include <shlib-compat.h> #include "semaphoreP.h" #include <kernel-features.h> +/* Returns FUTEX_PRIVATE if pshared is zero and private futexes are supported; + returns FUTEX_SHARED otherwise. + TODO Remove when cleaning up the futex API throughout glibc. */ +static __always_inline int +futex_private_if_supported (int pshared) +{ + if (pshared != 0) + return LLL_SHARED; +#ifdef __ASSUME_PRIVATE_FUTEX + return LLL_PRIVATE; +#else + return THREAD_GETMEM (THREAD_SELF, header.private_futex) + ^ FUTEX_PRIVATE_FLAG; +#endif +} + int -__new_sem_init (sem, pshared, value) - sem_t *sem; - int pshared; - unsigned int value; +__new_sem_init (sem_t *sem, int pshared, unsigned int value) { /* Parameter sanity check. */ if (__glibc_unlikely (value > SEM_VALUE_MAX)) @@ -40,16 +52,15 @@ __new_sem_init (sem, pshared, value) /* Map to the internal type. */ struct new_sem *isem = (struct new_sem *) sem; - /* Use the values the user provided. */ - isem->value = value; -#ifdef __ASSUME_PRIVATE_FUTEX - isem->private = pshared ? 0 : FUTEX_PRIVATE_FLAG; + /* Use the values the caller provided. */ +#if __HAVE_64B_ATOMICS + isem->data = value; #else - isem->private = pshared ? 0 : THREAD_GETMEM (THREAD_SELF, - header.private_futex); + isem->value = value << SEM_VALUE_SHIFT; + isem->nwaiters = 0; #endif - isem->nwaiters = 0; + isem->private = futex_private_if_supported (pshared); return 0; } |