mirror of git://git.musl-libc.org/musl
remove __lock dependency from exit
there's no sense in using a powerful lock in exit, because it will never be unlocked. a thread that arrives at exit while exit is already in progress just needs to hang forever. use the pause syscall for this because it's cheap and easy and universally available.
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@ -2,6 +2,8 @@
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#include <unistd.h>
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#include <stdio.h>
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#include "libc.h"
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#include "atomic.h"
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#include "syscall.h"
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static void dummy()
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{
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@ -13,10 +15,10 @@ weak_alias(dummy, __fflush_on_exit);
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void exit(int code)
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{
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static int lock[2];
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static int lock;
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/* If more than one thread calls exit, hang until _Exit ends it all */
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LOCK(lock);
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while (a_swap(&lock, 1)) __syscall(SYS_pause);
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/* Only do atexit & stdio flush if they were actually used */
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__funcs_on_exit();
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