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https://github.com/fluencelabs/musl
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ca52e34767
for now this is just a tiny optimization, but later if we support cancellation from __stdio_read and __stdio_write, it will be necessary for the recusrive lock count to be zero in order for these functions to know they are responsible for unlocking the FILE on cancellation.
19 lines
346 B
C
19 lines
346 B
C
#include "stdio_impl.h"
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#include "pthread_impl.h"
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int __lockfile(FILE *f)
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{
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int owner, tid = __pthread_self()->tid;
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if (f->lock == tid)
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return 0;
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while ((owner = a_cas(&f->lock, 0, tid)))
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__wait(&f->lock, &f->waiters, owner, 1);
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return 1;
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}
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void __unlockfile(FILE *f)
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{
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a_store(&f->lock, 0);
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if (f->waiters) __wake(&f->lock, 1, 1);
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}
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