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ntdll: Use FUTEX_PRIVATE_FLAG for critical section futexes when available.

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This commit is contained in:
Maarten Lankhorst 2011-08-03 20:27:43 +02:00 committed by Alexandre Julliard
parent e1ae573de5
commit 57493fdd8c
1 changed files with 11 additions and 2 deletions
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13
dlls/ntdll/critsection.c
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@ -61,14 +61,17 @@ static inline void small_pause(void)
#ifdef __linux__
static int wait_op = 128; /*FUTEX_WAIT|FUTEX_PRIVATE_FLAG*/
static int wake_op = 129; /*FUTEX_WAKE|FUTEX_PRIVATE_FLAG*/
static inline int futex_wait( int *addr, int val, struct timespec *timeout )
{
return syscall( SYS_futex, addr, 0/*FUTEX_WAIT*/, val, timeout, 0, 0 );
return syscall( SYS_futex, addr, wait_op, val, timeout, 0, 0 );
}
static inline int futex_wake( int *addr, int val )
{
return syscall( SYS_futex, addr, 1/*FUTEX_WAKE*/, val, NULL, 0, 0 );
return syscall( SYS_futex, addr, wake_op, val, NULL, 0, 0 );
}
static inline int use_futexes(void)
@ -78,6 +81,12 @@ static inline int use_futexes(void)
if (supported == -1)
{
futex_wait( &supported, 10, NULL );
if (errno == ENOSYS)
{
wait_op = 0; /*FUTEX_WAIT*/
wake_op = 1; /*FUTEX_WAKE*/
futex_wait( &supported, 10, NULL );
}
supported = (errno != ENOSYS);
}
return supported;