mirror of
https://github.com/fluencelabs/musl
synced 2025-05-23 04:31:32 +00:00
8aeee8db21
it's unclear whether EINVAL or ENOSYS is used when the operation is not supported, so check for both...
49 lines
1.4 KiB
C
49 lines
1.4 KiB
C
#include <pthread.h>
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#include <time.h>
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#include <errno.h>
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#include "futex.h"
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#include "syscall.h"
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static int do_wait(volatile int *addr, int val, clockid_t clk, const struct timespec *at, int cp, int priv)
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{
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int r, flag = 0;
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struct timespec to, *top=0;
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if (!at) goto notimeout;
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if (at->tv_nsec >= 1000000000UL)
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return EINVAL;
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if (clk == CLOCK_REALTIME || clk == CLOCK_MONOTONIC) {
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if (clk == CLOCK_REALTIME) flag = FUTEX_CLOCK_REALTIME;
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if (cp) r = -__syscall_cp(SYS_futex, addr, FUTEX_WAIT_BITSET|flag, val, at, 0, -1);
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else r = -__syscall(SYS_futex, addr, FUTEX_WAIT_BITSET|flag, val, at, 0, -1);
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if (r != EINVAL && r != ENOSYS) goto done;
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}
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if (clock_gettime(clk, &to)) return EINVAL;
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to.tv_sec = at->tv_sec - to.tv_sec;
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if ((to.tv_nsec = at->tv_nsec - to.tv_nsec) < 0) {
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to.tv_sec--;
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to.tv_nsec += 1000000000;
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}
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if (to.tv_sec < 0) return ETIMEDOUT;
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top = &to;
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notimeout:
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if (cp) r = -__syscall_cp(SYS_futex, addr, FUTEX_WAIT, val, top);
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else r = -__syscall(SYS_futex, addr, FUTEX_WAIT, val, top);
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done:
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if (r == EINTR || r == EINVAL || r == ETIMEDOUT) return r;
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return 0;
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}
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int __timedwait(volatile int *addr, int val, clockid_t clk, const struct timespec *at, void (*cleanup)(void *), void *arg, int priv)
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{
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int r;
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if (cleanup) {
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pthread_cleanup_push(cleanup, arg);
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r = do_wait(addr, val, clk, at, 1, priv);
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pthread_cleanup_pop(0);
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} else {
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r = do_wait(addr, val, clk, at, 0, priv);
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}
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return r;
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}
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