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-rw-r--r--libpthread/nptl/sysdeps/unix/sysv/linux/i386/lowlevellock.h105
1 files changed, 47 insertions, 58 deletions
diff --git a/libpthread/nptl/sysdeps/unix/sysv/linux/i386/lowlevellock.h b/libpthread/nptl/sysdeps/unix/sysv/linux/i386/lowlevellock.h
index b86f11c9b..785f2acf2 100644
--- a/libpthread/nptl/sysdeps/unix/sysv/linux/i386/lowlevellock.h
+++ b/libpthread/nptl/sysdeps/unix/sysv/linux/i386/lowlevellock.h
@@ -23,16 +23,25 @@
#include <time.h>
#include <sys/param.h>
#include <bits/pthreadtypes.h>
+#include <atomic.h>
+#include <sysdep.h>
+
+/* We have a separate internal lock implementation which is not tied
+ to binary compatibility. */
+
+/* Type for lock object. */
+typedef int lll_lock_t;
+
+/* Initializers for lock. */
+#define LLL_LOCK_INITIALIZER (0)
+#define LLL_LOCK_INITIALIZER_LOCKED (1)
+
+#include <tls.h>
#ifndef LOCK_INSTR
-# ifdef UP
-# define LOCK_INSTR /* nothing */
-# else
-# define LOCK_INSTR "lock;"
-# endif
+# define LOCK_INSTR "lock;"
#endif
-#define SYS_futex 240
#define FUTEX_WAIT 0
#define FUTEX_WAKE 1
@@ -51,47 +60,39 @@
# define LLL_EBX_REG "b"
#endif
-#ifdef I386_USE_SYSENTER
-# ifdef SHARED
-# define LLL_ENTER_KERNEL "call *%%gs:%P6\n\t"
-# else
-# define LLL_ENTER_KERNEL "call *_dl_sysinfo\n\t"
-# endif
-#else
-# define LLL_ENTER_KERNEL "int $0x80\n\t"
-#endif
+#define LLL_ENTER_KERNEL "int $0x80\n\t"
/* Delay in spinlock loop. */
-#define BUSY_WAIT_NOP asm ("rep; nop")
+#define BUSY_WAIT_NOP __asm__ ("rep; nop")
#define lll_futex_wait(futex, val) \
- do { \
- int __ignore; \
- register __typeof (val) _val asm ("edx") = (val); \
- __asm __volatile (LLL_EBX_LOAD \
+ ({ \
+ int __ret; \
+ register __typeof (val) _val __asm__ ("edx") = (val); \
+ __asm__ __volatile (LLL_EBX_LOAD \
LLL_ENTER_KERNEL \
LLL_EBX_LOAD \
- : "=a" (__ignore) \
+ : "=a" (__ret) \
: "0" (SYS_futex), LLL_EBX_REG (futex), "S" (0), \
"c" (FUTEX_WAIT), "d" (_val), \
"i" (offsetof (tcbhead_t, sysinfo))); \
- } while (0)
+ __ret; })
#define lll_futex_wake(futex, nr) \
- do { \
- int __ignore; \
- register __typeof (nr) _nr asm ("edx") = (nr); \
- __asm __volatile (LLL_EBX_LOAD \
+ ({ \
+ int __ret; \
+ register __typeof (nr) _nr __asm__ ("edx") = (nr); \
+ __asm__ __volatile (LLL_EBX_LOAD \
LLL_ENTER_KERNEL \
LLL_EBX_LOAD \
- : "=a" (__ignore) \
+ : "=a" (__ret) \
: "0" (SYS_futex), LLL_EBX_REG (futex), \
"c" (FUTEX_WAKE), "d" (_nr), \
"i" (0) /* phony, to align next arg's number */, \
"i" (offsetof (tcbhead_t, sysinfo))); \
- } while (0)
+ __ret; })
/* Does not preserve %eax and %ecx. */
@@ -113,7 +114,7 @@ extern int __lll_mutex_unlock_wake (int *__futex)
to be nonzero. */
#define lll_mutex_trylock(futex) \
({ int ret; \
- __asm __volatile (LOCK_INSTR "cmpxchgl %2, %1" \
+ __asm__ __volatile (LOCK_INSTR "cmpxchgl %2, %1" \
: "=a" (ret), "=m" (futex) \
: "r" (LLL_MUTEX_LOCK_INITIALIZER_LOCKED), "m" (futex),\
"0" (LLL_MUTEX_LOCK_INITIALIZER) \
@@ -123,7 +124,7 @@ extern int __lll_mutex_unlock_wake (int *__futex)
#define lll_mutex_cond_trylock(futex) \
({ int ret; \
- __asm __volatile (LOCK_INSTR "cmpxchgl %2, %1" \
+ __asm__ __volatile (LOCK_INSTR "cmpxchgl %2, %1" \
: "=a" (ret), "=m" (futex) \
: "r" (LLL_MUTEX_LOCK_INITIALIZER_WAITERS), \
"m" (futex), "0" (LLL_MUTEX_LOCK_INITIALIZER) \
@@ -133,7 +134,7 @@ extern int __lll_mutex_unlock_wake (int *__futex)
#define lll_mutex_lock(futex) \
(void) ({ int ignore1, ignore2; \
- __asm __volatile (LOCK_INSTR "cmpxchgl %1, %2\n\t" \
+ __asm__ __volatile (LOCK_INSTR "cmpxchgl %1, %2\n\t" \
"jnz _L_mutex_lock_%=\n\t" \
".subsection 1\n\t" \
".type _L_mutex_lock_%=,@function\n" \
@@ -153,7 +154,7 @@ extern int __lll_mutex_unlock_wake (int *__futex)
always wakeup waiters. */
#define lll_mutex_cond_lock(futex) \
(void) ({ int ignore1, ignore2; \
- __asm __volatile (LOCK_INSTR "cmpxchgl %1, %2\n\t" \
+ __asm__ __volatile (LOCK_INSTR "cmpxchgl %1, %2\n\t" \
"jnz _L_mutex_cond_lock_%=\n\t" \
".subsection 1\n\t" \
".type _L_mutex_cond_lock_%=,@function\n" \
@@ -171,7 +172,7 @@ extern int __lll_mutex_unlock_wake (int *__futex)
#define lll_mutex_timedlock(futex, timeout) \
({ int result, ignore1, ignore2; \
- __asm __volatile (LOCK_INSTR "cmpxchgl %1, %3\n\t" \
+ __asm__ __volatile (LOCK_INSTR "cmpxchgl %1, %3\n\t" \
"jnz _L_mutex_timedlock_%=\n\t" \
".subsection 1\n\t" \
".type _L_mutex_timedlock_%=,@function\n" \
@@ -192,7 +193,7 @@ extern int __lll_mutex_unlock_wake (int *__futex)
#define lll_mutex_unlock(futex) \
(void) ({ int ignore; \
- __asm __volatile (LOCK_INSTR "subl $1,%0\n\t" \
+ __asm__ __volatile (LOCK_INSTR "subl $1,%0\n\t" \
"jne _L_mutex_unlock_%=\n\t" \
".subsection 1\n\t" \
".type _L_mutex_unlock_%=,@function\n" \
@@ -212,17 +213,6 @@ extern int __lll_mutex_unlock_wake (int *__futex)
(futex != 0)
-/* We have a separate internal lock implementation which is not tied
- to binary compatibility. */
-
-/* Type for lock object. */
-typedef int lll_lock_t;
-
-/* Initializers for lock. */
-#define LLL_LOCK_INITIALIZER (0)
-#define LLL_LOCK_INITIALIZER_LOCKED (1)
-
-
extern int __lll_lock_wait (int val, int *__futex)
__attribute ((regparm (2))) attribute_hidden;
extern int __lll_unlock_wake (int *__futex)
@@ -236,20 +226,19 @@ extern int lll_unlock_wake_cb (int *__futex) attribute_hidden;
2 - taken by more users */
-#if defined NOT_IN_libc || defined UP
+#if defined NOT_IN_libc
# define lll_trylock(futex) lll_mutex_trylock (futex)
# define lll_lock(futex) lll_mutex_lock (futex)
# define lll_unlock(futex) lll_mutex_unlock (futex)
#else
/* Special versions of the macros for use in libc itself. They avoid
- the lock prefix when the thread library is not used.
+ the lock prefix when the thread library is not used. */
+
- XXX In future we might even want to avoid it on UP machines. */
-# include <tls.h>
# define lll_trylock(futex) \
({ unsigned char ret; \
- __asm __volatile ("cmpl $0, %%gs:%P5\n\t" \
+ __asm__ __volatile ("cmpl $0, %%gs:%P5\n\t" \
"je,pt 0f\n\t" \
"lock\n" \
"0:\tcmpxchgl %2, %1; setne %0" \
@@ -263,7 +252,7 @@ extern int lll_unlock_wake_cb (int *__futex) attribute_hidden;
# define lll_lock(futex) \
(void) ({ int ignore1, ignore2; \
- __asm __volatile ("cmpl $0, %%gs:%P6\n\t" \
+ __asm__ __volatile ("cmpl $0, %%gs:%P6\n\t" \
"je,pt 0f\n\t" \
"lock\n" \
"0:\tcmpxchgl %1, %2\n\t" \
@@ -285,7 +274,7 @@ extern int lll_unlock_wake_cb (int *__futex) attribute_hidden;
# define lll_unlock(futex) \
(void) ({ int ignore; \
- __asm __volatile ("cmpl $0, %%gs:%P3\n\t" \
+ __asm__ __volatile ("cmpl $0, %%gs:%P3\n\t" \
"je,pt 0f\n\t" \
"lock\n" \
"0:\tsubl $1,%0\n\t" \
@@ -317,21 +306,21 @@ extern int lll_unlock_wake_cb (int *__futex) attribute_hidden;
The macro parameter must not have any side effect. */
#define lll_wait_tid(tid) \
- do { \
- int __ignore; \
- register __typeof (tid) _tid asm ("edx") = (tid); \
+ ({ \
+ int __ret; \
+ register __typeof (tid) _tid __asm__ ("edx") = (tid); \
if (_tid != 0) \
- __asm __volatile (LLL_EBX_LOAD \
+ __asm__ __volatile (LLL_EBX_LOAD \
"1:\tmovl %1, %%eax\n\t" \
LLL_ENTER_KERNEL \
"cmpl $0, (%%ebx)\n\t" \
"jne,pn 1b\n\t" \
LLL_EBX_LOAD \
- : "=&a" (__ignore) \
+ : "=&a" (__ret) \
: "i" (SYS_futex), LLL_EBX_REG (&tid), "S" (0), \
"c" (FUTEX_WAIT), "d" (_tid), \
"i" (offsetof (tcbhead_t, sysinfo))); \
- } while (0)
+ __ret; })
extern int __lll_timedwait_tid (int *tid, const struct timespec *abstime)
__attribute__ ((regparm (2))) attribute_hidden;
generated by cgit v1.2.3 (git 2.25.1) at 2025-11-14 10:36:42 +0000