diff options
Diffstat (limited to 'src/thread/__wait.c')
| -rw-r--r-- | src/thread/__wait.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/src/thread/__wait.c b/src/thread/__wait.c new file mode 100644 index 0000000..dc33c1a --- /dev/null +++ b/src/thread/__wait.c @@ -0,0 +1,17 @@ +#include "pthread_impl.h" + +void __wait(volatile int *addr, volatile int *waiters, int val, int priv) +{ + int spins=100; + if (priv) priv = FUTEX_PRIVATE; + while (spins-- && (!waiters || !*waiters)) { + if (*addr==val) a_spin(); + else return; + } + if (waiters) a_inc(waiters); + while (*addr==val) { + __syscall(SYS_futex, addr, FUTEX_WAIT|priv, val, 0) != -ENOSYS + || __syscall(SYS_futex, addr, FUTEX_WAIT, val, 0); + } + if (waiters) a_dec(waiters); +} |