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replace __wake function with macro that performs direct syscall

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this should generate faster and smaller code, especially with inline
syscalls. the conditional with cnt is ugly, but thankfully cnt is
always a constant anyway so it gets evaluated at compile time. it may
be preferable to make separate __wake and __wakeall macros without a
count argument.

priv flag is not used yet; private futex support still needs to be
done at some point in the future.
This commit is contained in:
Rich Felker 2013-02-01 16:41:53 -05:00
parent 96fbcf7d80
commit facc6acbfd
2 changed files with 2 additions and 10 deletions
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3
src/internal/pthread_impl.h
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@ -106,7 +106,8 @@ void __unmapself(void *, size_t);
int __timedwait(volatile int *, int, clockid_t, const struct timespec *, void (*)(void *), void *, int);
void __wait(volatile int *, volatile int *, int, int);
void __wake(volatile int *, int, int);
#define __wake(addr, cnt, priv) \
__syscall(SYS_futex, addr, FUTEX_WAKE, (cnt)<0?INT_MAX:(cnt))
void __acquire_ptc();
void __release_ptc();

9
src/thread/__wake.c
View File

@ -1,9 +0,0 @@
#include "pthread_impl.h"
#include <limits.h>
void __wake(volatile int *addr, int cnt, int priv)
{
if (priv) priv = 128; priv=0;
if (cnt<0) cnt = INT_MAX;
__syscall(SYS_futex, (long)addr, FUTEX_WAKE | priv, cnt);
}