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Removed the x86 specific __compare_and_swap() implementation and

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added a generic implementation using atomic_test_and_set().


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@15444 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
Ingo Weinhold
2005-12-09 14:11:44 +00:00
parent 0799002097
commit 7c360a1007
1 changed files with 4 additions and 14 deletions
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src/system/libroot/posix/glibc/include/bits/libc-lock.h
+4 -14
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@@ -5,8 +5,9 @@
#ifndef _BITS_LIBC_LOCK_H #ifndef _BITS_LIBC_LOCK_H
#define _BITS_LIBC_LOCK_H 1 #define _BITS_LIBC_LOCK_H 1
#include <OS.h>
#include <Errors.h> #include <Errors.h>
#include <OS.h>
#include <SupportDefs.h>
/* Helper definitions and prototypes. */ /* Helper definitions and prototypes. */
@@ -15,24 +16,13 @@
extern char _single_threaded; extern char _single_threaded;
#ifdef __INTEL__
// ToDo: this does not belong here!
static inline int static inline int
__compare_and_swap (volatile int32 *p, int oldval, int newval) __compare_and_swap (volatile int32 *p, int oldval, int newval)
{ {
char ret; int32 readval = atomic_test_and_set(p, newval, oldval);
long int readval; return (readval == oldval ? 1 : 0);
__asm__ __volatile__ ("lock; cmpxchgl %3, %1; sete %0"
: "=q" (ret), "=m" (*p), "=a" (readval)
: "r" (newval), "m" (*p), "a" (oldval));
return ret;
} }
#endif
/* Mutex type. */ /* Mutex type. */
typedef struct __libc_lock_t { typedef struct __libc_lock_t {