diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/powerpc/lowlevellock.h')
| -rw-r--r-- | sysdeps/unix/sysv/linux/powerpc/lowlevellock.h | 19 |
1 files changed, 17 insertions, 2 deletions
diff --git a/sysdeps/unix/sysv/linux/powerpc/lowlevellock.h b/sysdeps/unix/sysv/linux/powerpc/lowlevellock.h index d7e1e38cc6..a651d23c50 100644 --- a/sysdeps/unix/sysv/linux/powerpc/lowlevellock.h +++ b/sysdeps/unix/sysv/linux/powerpc/lowlevellock.h @@ -190,13 +190,28 @@ # endif #endif +/* Set *futex to ID if it is 0, atomically. Returns the old value */ +#define __lll_base_trylock(futex, id) \ + ({ int __val; \ + __asm __volatile ("1: lwarx %0,0,%2" MUTEX_HINT_ACQ "\n" \ + " cmpwi 0,%0,0\n" \ + " bne 2f\n" \ + " stwcx. %3,0,%2\n" \ + " bne- 1b\n" \ + "2: " __lll_acq_instr \ + : "=&r" (__val), "=m" (*futex) \ + : "r" (futex), "r" (id), "m" (*futex) \ + : "cr0", "memory"); \ + __val; \ + }) + /* Set *futex to 1 if it is 0, atomically. Returns the old value */ -#define __lll_trylock(futex) __lll_robust_trylock (futex, 1) +#define __lll_trylock(futex) __lll_base_trylock (futex, 1) #define lll_trylock(lock) __lll_trylock (&(lock)) /* Set *futex to 2 if it is 0, atomically. Returns the old value */ -#define __lll_cond_trylock(futex) __lll_robust_trylock (futex, 2) +#define __lll_cond_trylock(futex) __lll_base_trylock (futex, 2) #define lll_cond_trylock(lock) __lll_cond_trylock (&(lock)) |