diff options
Diffstat (limited to 'nptl/sysdeps/unix/sysv/linux/powerpc/sem_post.c')
| -rw-r--r-- | nptl/sysdeps/unix/sysv/linux/powerpc/sem_post.c | 32 |
1 files changed, 28 insertions, 4 deletions
diff --git a/nptl/sysdeps/unix/sysv/linux/powerpc/sem_post.c b/nptl/sysdeps/unix/sysv/linux/powerpc/sem_post.c index 0b18cdbcde..fd92f7b32d 100644 --- a/nptl/sysdeps/unix/sysv/linux/powerpc/sem_post.c +++ b/nptl/sysdeps/unix/sysv/linux/powerpc/sem_post.c @@ -29,11 +29,37 @@ int __new_sem_post (sem_t *sem) { + struct new_sem *isem = (struct new_sem *) sem; + + __asm __volatile (__lll_rel_instr ::: "memory"); + atomic_increment (&isem->value); + __asm __volatile (__lll_acq_instr ::: "memory"); + if (isem->nwaiters > 0) + { + int err = lll_futex_wake (&isem->value, 1, + isem->private ^ FUTEX_PRIVATE_FLAG); + if (__builtin_expect (err, 0) < 0) + { + __set_errno (-err); + return -1; + } + } + return 0; +} +versioned_symbol (libpthread, __new_sem_post, sem_post, GLIBC_2_1); + +#if SHLIB_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_1) + +int +attribute_compat_text_section +__old_sem_post (sem_t *sem) +{ int *futex = (int *) sem; __asm __volatile (__lll_rel_instr ::: "memory"); int nr = atomic_increment_val (futex); - int err = lll_futex_wake (futex, nr, LLL_SHARED); + /* We always have to assume it is a shared semaphore. */ + int err = lll_futex_wake (futex, 1, LLL_SHARED); if (__builtin_expect (err, 0) < 0) { __set_errno (-err); @@ -41,8 +67,6 @@ __new_sem_post (sem_t *sem) } return 0; } -versioned_symbol (libpthread, __new_sem_post, sem_post, GLIBC_2_1); -#if SHLIB_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_1) -strong_alias (__new_sem_post, __old_sem_post) + compat_symbol (libpthread, __old_sem_post, sem_post, GLIBC_2_0); #endif |