25 lines
412 B
C
25 lines
412 B
C
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#include <errno.h>
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#include <magenta/futex.h>
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#include <pthread.h>
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int pthread_mutex_lock(pthread_mutex_t *mut)
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{
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kern_futex_t expected = 0;
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while (1) {
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expected = 0;
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if (__atomic_compare_exchange_n(
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&mut->__v,
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&expected,
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1,
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0,
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__ATOMIC_ACQUIRE,
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__ATOMIC_ACQUIRE)) {
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return 0;
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}
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futex_wait(&mut->__v, 1, FUTEX_PRIVATE);
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}
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return __set_errno(EAGAIN);
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}
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