mirror of
https://github.com/fluencelabs/musl
synced 2025-05-28 15:11:34 +00:00
7e6be42a77
the issue was a break statement that was breaking only from the switch, not the enclosing for loop, and a failure to set the final success state.
38 lines
806 B
C
38 lines
806 B
C
#include "pthread_impl.h"
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static void undo(void *control)
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{
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a_store(control, 0);
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__wake(control, 1, 0);
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}
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int pthread_once(pthread_once_t *control, void (*init)(void))
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{
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static int waiters;
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/* Return immediately if init finished before */
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if (*control == 2) return 0;
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/* Try to enter initializing state. Three possibilities:
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* 0 - we're the first or the other cancelled; run init
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* 1 - another thread is running init; wait
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* 2 - another thread finished running init; just return */
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for (;;) switch (a_swap(control, 1)) {
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case 0:
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pthread_cleanup_push(undo, control);
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init();
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pthread_cleanup_pop(0);
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a_store(control, 2);
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if (waiters) __wake(control, -1, 0);
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return 0;
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case 1:
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__wait(control, &waiters, 1, 0);
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continue;
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case 2:
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a_store(control, 2);
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return 0;
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}
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}
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