diff options
Diffstat (limited to 'libpthread/nptl/sysdeps/unix/sysv/linux/i386/lowlevellock.h')
| -rw-r--r-- | libpthread/nptl/sysdeps/unix/sysv/linux/i386/lowlevellock.h | 703 |
1 files changed, 461 insertions, 242 deletions
diff --git a/libpthread/nptl/sysdeps/unix/sysv/linux/i386/lowlevellock.h b/libpthread/nptl/sysdeps/unix/sysv/linux/i386/lowlevellock.h index 97f3b09e2..55add8b8e 100644 --- a/libpthread/nptl/sysdeps/unix/sysv/linux/i386/lowlevellock.h +++ b/libpthread/nptl/sysdeps/unix/sysv/linux/i386/lowlevellock.h @@ -1,4 +1,4 @@ -/* Copyright (C) 2002, 2003, 2004 Free Software Foundation, Inc. +/* Copyright (C) 2002-2004, 2006-2008, 2009 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Ulrich Drepper <drepper@redhat.com>, 2002. @@ -20,36 +20,87 @@ #ifndef _LOWLEVELLOCK_H #define _LOWLEVELLOCK_H 1 -#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 -# define LOCK_INSTR "lock;" +#ifndef __ASSEMBLER__ +# include <time.h> +# include <sys/param.h> +# include <bits/pthreadtypes.h> +# include <bits/kernel-features.h> +# include <tcb-offsets.h> + +# ifndef LOCK_INSTR +# ifdef UP +# define LOCK_INSTR /* nothing */ +# else +# define LOCK_INSTR "lock;" +# endif +# endif +#else +# ifndef LOCK +# ifdef UP +# define LOCK +# else +# define LOCK lock +# endif +# endif #endif #define FUTEX_WAIT 0 #define FUTEX_WAKE 1 +#define FUTEX_CMP_REQUEUE 4 +#define FUTEX_WAKE_OP 5 +#define FUTEX_LOCK_PI 6 +#define FUTEX_UNLOCK_PI 7 +#define FUTEX_TRYLOCK_PI 8 +#define FUTEX_WAIT_BITSET 9 +#define FUTEX_WAKE_BITSET 10 +#define FUTEX_WAIT_REQUEUE_PI 11 +#define FUTEX_CMP_REQUEUE_PI 12 +#define FUTEX_PRIVATE_FLAG 128 +#define FUTEX_CLOCK_REALTIME 256 + +#define FUTEX_BITSET_MATCH_ANY 0xffffffff + +#define FUTEX_OP_CLEAR_WAKE_IF_GT_ONE ((4 << 24) | 1) + +/* Values for 'private' parameter of locking macros. Yes, the + definition seems to be backwards. But it is not. The bit will be + reversed before passing to the system call. */ +#define LLL_PRIVATE 0 +#define LLL_SHARED FUTEX_PRIVATE_FLAG + + +#if !defined NOT_IN_libc || defined IS_IN_rtld +/* In libc.so or ld.so all futexes are private. */ +# ifdef __ASSUME_PRIVATE_FUTEX +# define __lll_private_flag(fl, private) \ + ((fl) | FUTEX_PRIVATE_FLAG) +# else +# define __lll_private_flag(fl, private) \ + ((fl) | THREAD_GETMEM (THREAD_SELF, header.private_futex)) +# endif +#else +# ifdef __ASSUME_PRIVATE_FUTEX +# define __lll_private_flag(fl, private) \ + (((fl) | FUTEX_PRIVATE_FLAG) ^ (private)) +# else +# define __lll_private_flag(fl, private) \ + (__builtin_constant_p (private) \ + ? ((private) == 0 \ + ? ((fl) | THREAD_GETMEM (THREAD_SELF, header.private_futex)) \ + : (fl)) \ + : ({ unsigned int __fl = ((private) ^ FUTEX_PRIVATE_FLAG); \ + __asm__ ("andl %%gs:%P1, %0" : "+r" (__fl) \ + : "i" (offsetof (struct pthread, header.private_futex))); \ + __fl | (fl); })) +# endif +#endif +#ifndef __ASSEMBLER__ /* Initializer for compatibility lock. */ -#define LLL_MUTEX_LOCK_INITIALIZER (0) -#define LLL_MUTEX_LOCK_INITIALIZER_LOCKED (1) -#define LLL_MUTEX_LOCK_INITIALIZER_WAITERS (2) +#define LLL_LOCK_INITIALIZER (0) +#define LLL_LOCK_INITIALIZER_LOCKED (1) +#define LLL_LOCK_INITIALIZER_WAITERS (2) #ifdef __PIC__ @@ -60,247 +111,436 @@ typedef int lll_lock_t; # define LLL_EBX_REG "b" #endif -#define LLL_ENTER_KERNEL "int $0x80\n\t" +#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 /* Delay in spinlock loop. */ -#define BUSY_WAIT_NOP __asm__ ("rep; nop") - -#define lll_futex_wait(futex, val) \ - lll_futex_timed_wait (futex, val, NULL) - -#define lll_futex_timed_wait(futex, val, timeout) \ +#define BUSY_WAIT_NOP __asm__ ("rep; nop") + + +#define LLL_STUB_UNWIND_INFO_START \ + ".section .eh_frame,\"a\",@progbits\n" \ +"5:\t" ".long 7f-6f # Length of Common Information Entry\n" \ +"6:\t" ".long 0x0 # CIE Identifier Tag\n\t" \ + ".byte 0x1 # CIE Version\n\t" \ + ".ascii \"zR\\0\" # CIE Augmentation\n\t" \ + ".uleb128 0x1 # CIE Code Alignment Factor\n\t" \ + ".sleb128 -4 # CIE Data Alignment Factor\n\t" \ + ".byte 0x8 # CIE RA Column\n\t" \ + ".uleb128 0x1 # Augmentation size\n\t" \ + ".byte 0x1b # FDE Encoding (pcrel sdata4)\n\t" \ + ".byte 0xc # DW_CFA_def_cfa\n\t" \ + ".uleb128 0x4\n\t" \ + ".uleb128 0x0\n\t" \ + ".align 4\n" \ +"7:\t" ".long 17f-8f # FDE Length\n" \ +"8:\t" ".long 8b-5b # FDE CIE offset\n\t" \ + ".long 1b-. # FDE initial location\n\t" \ + ".long 4b-1b # FDE address range\n\t" \ + ".uleb128 0x0 # Augmentation size\n\t" \ + ".byte 0x16 # DW_CFA_val_expression\n\t" \ + ".uleb128 0x8\n\t" \ + ".uleb128 10f-9f\n" \ +"9:\t" ".byte 0x78 # DW_OP_breg8\n\t" \ + ".sleb128 3b-1b\n" +#define LLL_STUB_UNWIND_INFO_END \ + ".byte 0x16 # DW_CFA_val_expression\n\t" \ + ".uleb128 0x8\n\t" \ + ".uleb128 12f-11f\n" \ +"11:\t" ".byte 0x78 # DW_OP_breg8\n\t" \ + ".sleb128 3b-2b\n" \ +"12:\t" ".byte 0x40 + (3b-2b-1) # DW_CFA_advance_loc\n\t" \ + ".byte 0x16 # DW_CFA_val_expression\n\t" \ + ".uleb128 0x8\n\t" \ + ".uleb128 16f-13f\n" \ +"13:\t" ".byte 0x78 # DW_OP_breg8\n\t" \ + ".sleb128 15f-14f\n\t" \ + ".byte 0x0d # DW_OP_const4s\n" \ +"14:\t" ".4byte 3b-.\n\t" \ + ".byte 0x1c # DW_OP_minus\n\t" \ + ".byte 0x0d # DW_OP_const4s\n" \ +"15:\t" ".4byte 18f-.\n\t" \ + ".byte 0x22 # DW_OP_plus\n" \ +"16:\t" ".align 4\n" \ +"17:\t" ".previous\n" + +/* Unwind info for + 1: lea ..., ... + 2: call ... + 3: jmp 18f + 4: + snippet. */ +#define LLL_STUB_UNWIND_INFO_3 \ +LLL_STUB_UNWIND_INFO_START \ +"10:\t" ".byte 0x40 + (2b-1b) # DW_CFA_advance_loc\n\t" \ +LLL_STUB_UNWIND_INFO_END + +/* Unwind info for + 1: lea ..., ... + 0: movl ..., ... + 2: call ... + 3: jmp 18f + 4: + snippet. */ +#define LLL_STUB_UNWIND_INFO_4 \ +LLL_STUB_UNWIND_INFO_START \ +"10:\t" ".byte 0x40 + (0b-1b) # DW_CFA_advance_loc\n\t" \ + ".byte 0x16 # DW_CFA_val_expression\n\t" \ + ".uleb128 0x8\n\t" \ + ".uleb128 20f-19f\n" \ +"19:\t" ".byte 0x78 # DW_OP_breg8\n\t" \ + ".sleb128 3b-0b\n" \ +"20:\t" ".byte 0x40 + (2b-0b) # DW_CFA_advance_loc\n\t" \ +LLL_STUB_UNWIND_INFO_END + + +#define lll_futex_wait(futex, val, private) \ + lll_futex_timed_wait (futex, val, NULL, private) + + +#define lll_futex_timed_wait(futex, val, timeout, private) \ ({ \ - int __ret; \ - register __typeof (val) _val __asm__ ("edx") = (val); \ + int __status; \ + register __typeof (val) _val __asm__ ("edx") = (val); \ __asm__ __volatile (LLL_EBX_LOAD \ LLL_ENTER_KERNEL \ LLL_EBX_LOAD \ - : "=a" (__ret) \ + : "=a" (__status) \ : "0" (SYS_futex), LLL_EBX_REG (futex), "S" (timeout), \ - "c" (FUTEX_WAIT), "d" (_val), \ - "i" (offsetof (tcbhead_t, sysinfo))); \ - __ret; }) + "c" (__lll_private_flag (FUTEX_WAIT, private)), \ + "d" (_val), "i" (offsetof (tcbhead_t, sysinfo)) \ + : "memory"); \ + __status; \ + }) -#define lll_futex_wake(futex, nr) \ - ({ \ - int __ret; \ +#define lll_futex_wake(futex, nr, private) \ + do { \ + int __ignore; \ register __typeof (nr) _nr __asm__ ("edx") = (nr); \ __asm__ __volatile (LLL_EBX_LOAD \ LLL_ENTER_KERNEL \ LLL_EBX_LOAD \ - : "=a" (__ret) \ + : "=a" (__ignore) \ : "0" (SYS_futex), LLL_EBX_REG (futex), \ - "c" (FUTEX_WAKE), "d" (_nr), \ + "c" (__lll_private_flag (FUTEX_WAKE, private)), \ + "d" (_nr), \ "i" (0) /* phony, to align next arg's number */, \ "i" (offsetof (tcbhead_t, sysinfo))); \ - __ret; }) - - -/* Does not preserve %eax and %ecx. */ -extern int __lll_mutex_lock_wait (int val, int *__futex) - __attribute ((regparm (2))) attribute_hidden; -/* Does not preserve %eax, %ecx, and %edx. */ -extern int __lll_mutex_timedlock_wait (int val, int *__futex, - const struct timespec *abstime) - __attribute ((regparm (3))) attribute_hidden; -/* Preserves all registers but %eax. */ -extern int __lll_mutex_unlock_wake (int *__futex) - __attribute ((regparm (1))) attribute_hidden; + } while (0) -/* NB: in the lll_mutex_trylock macro we simply return the value in %eax +/* NB: in the lll_trylock macro we simply return the value in %eax after the cmpxchg instruction. In case the operation succeded this value is zero. In case the operation failed, the cmpxchg instruction has loaded the current value of the memory work which is guaranteed to be nonzero. */ -#define lll_mutex_trylock(futex) \ +#if defined NOT_IN_libc || defined UP +# define __lll_trylock_asm LOCK_INSTR "cmpxchgl %2, %1" +#else +# define __lll_trylock_asm "cmpl $0, %%gs:%P5\n\t" \ + "je 0f\n\t" \ + "lock\n" \ + "0:\tcmpxchgl %2, %1" +#endif + +#define lll_trylock(futex) \ + ({ int ret; \ + __asm__ __volatile (__lll_trylock_asm \ + : "=a" (ret), "=m" (futex) \ + : "r" (LLL_LOCK_INITIALIZER_LOCKED), "m" (futex), \ + "0" (LLL_LOCK_INITIALIZER), \ + "i" (MULTIPLE_THREADS_OFFSET) \ + : "memory"); \ + ret; }) + +#define lll_robust_trylock(futex, id) \ ({ int ret; \ __asm__ __volatile (LOCK_INSTR "cmpxchgl %2, %1" \ : "=a" (ret), "=m" (futex) \ - : "r" (LLL_MUTEX_LOCK_INITIALIZER_LOCKED), "m" (futex),\ - "0" (LLL_MUTEX_LOCK_INITIALIZER) \ + : "r" (id), "m" (futex), \ + "0" (LLL_LOCK_INITIALIZER) \ : "memory"); \ ret; }) -#define lll_mutex_cond_trylock(futex) \ +#define lll_cond_trylock(futex) \ ({ int ret; \ __asm__ __volatile (LOCK_INSTR "cmpxchgl %2, %1" \ : "=a" (ret), "=m" (futex) \ - : "r" (LLL_MUTEX_LOCK_INITIALIZER_WAITERS), \ - "m" (futex), "0" (LLL_MUTEX_LOCK_INITIALIZER) \ + : "r" (LLL_LOCK_INITIALIZER_WAITERS), \ + "m" (futex), "0" (LLL_LOCK_INITIALIZER) \ : "memory"); \ ret; }) +#if defined NOT_IN_libc || defined UP +# define __lll_lock_asm_start LOCK_INSTR "cmpxchgl %1, %2\n\t" +#else +# define __lll_lock_asm_start "cmpl $0, %%gs:%P6\n\t" \ + "je 0f\n\t" \ + "lock\n" \ + "0:\tcmpxchgl %1, %2\n\t" +#endif -#define lll_mutex_lock(futex) \ - (void) ({ int ignore1, ignore2; \ - __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" \ - "_L_mutex_lock_%=:\n\t" \ - "leal %2, %%ecx\n\t" \ - "call __lll_mutex_lock_wait\n\t" \ - "jmp 1f\n\t" \ - ".size _L_mutex_lock_%=,.-_L_mutex_lock_%=\n" \ - ".previous\n" \ - "1:" \ - : "=a" (ignore1), "=c" (ignore2), "=m" (futex) \ - : "0" (0), "1" (1), "m" (futex) \ - : "memory"); }) - - -/* Special version of lll_mutex_lock which causes the unlock function to - always wakeup waiters. */ -#define lll_mutex_cond_lock(futex) \ - (void) ({ int ignore1, ignore2; \ - __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" \ - "_L_mutex_cond_lock_%=:\n\t" \ - "leal %2, %%ecx\n\t" \ - "call __lll_mutex_lock_wait\n\t" \ - "jmp 1f\n\t" \ - ".size _L_mutex_cond_lock_%=,.-_L_mutex_cond_lock_%=\n" \ - ".previous\n" \ - "1:" \ - : "=a" (ignore1), "=c" (ignore2), "=m" (futex) \ - : "0" (0), "1" (2), "m" (futex) \ - : "memory"); }) - - -#define lll_mutex_timedlock(futex, timeout) \ - ({ int _result, ignore1, ignore2; \ - __asm__ __volatile (LOCK_INSTR "cmpxchgl %1, %3\n\t" \ - "jnz _L_mutex_timedlock_%=\n\t" \ +#define lll_lock(futex, private) \ + (void) \ + ({ int ignore1, ignore2; \ + if (__builtin_constant_p (private) && (private) == LLL_PRIVATE) \ + __asm__ __volatile (__lll_lock_asm_start \ + "jnz _L_lock_%=\n\t" \ + ".subsection 1\n\t" \ + ".type _L_lock_%=,@function\n" \ + "_L_lock_%=:\n" \ + "1:\tleal %2, %%ecx\n" \ + "2:\tcall __lll_lock_wait_private\n" \ + "3:\tjmp 18f\n" \ + "4:\t.size _L_lock_%=, 4b-1b\n\t" \ + ".previous\n" \ + LLL_STUB_UNWIND_INFO_3 \ + "18:" \ + : "=a" (ignore1), "=c" (ignore2), "=m" (futex) \ + : "0" (0), "1" (1), "m" (futex), \ + "i" (MULTIPLE_THREADS_OFFSET) \ + : "memory"); \ + else \ + { \ + int ignore3; \ + __asm__ __volatile (__lll_lock_asm_start \ + "jnz _L_lock_%=\n\t" \ + ".subsection 1\n\t" \ + ".type _L_lock_%=,@function\n" \ + "_L_lock_%=:\n" \ + "1:\tleal %2, %%edx\n" \ + "0:\tmovl %8, %%ecx\n" \ + "2:\tcall __lll_lock_wait\n" \ + "3:\tjmp 18f\n" \ + "4:\t.size _L_lock_%=, 4b-1b\n\t" \ + ".previous\n" \ + LLL_STUB_UNWIND_INFO_4 \ + "18:" \ + : "=a" (ignore1), "=c" (ignore2), \ + "=m" (futex), "=&d" (ignore3) \ + : "1" (1), "m" (futex), \ + "i" (MULTIPLE_THREADS_OFFSET), "0" (0), \ + "g" ((int) (private)) \ + : "memory"); \ + } \ + }) + +#define lll_robust_lock(futex, id, private) \ + ({ int __result, ignore1, ignore2; \ + __asm__ __volatile (LOCK_INSTR "cmpxchgl %1, %2\n\t" \ + "jnz _L_robust_lock_%=\n\t" \ ".subsection 1\n\t" \ - ".type _L_mutex_timedlock_%=,@function\n" \ - "_L_mutex_timedlock_%=:\n\t" \ - "leal %3, %%ecx\n\t" \ - "movl %7, %%edx\n\t" \ - "call __lll_mutex_timedlock_wait\n\t" \ - "jmp 1f\n\t" \ - ".size _L_mutex_timedlock_%=,.-_L_mutex_timedlock_%=\n"\ + ".type _L_robust_lock_%=,@function\n" \ + "_L_robust_lock_%=:\n" \ + "1:\tleal %2, %%edx\n" \ + "0:\tmovl %7, %%ecx\n" \ + "2:\tcall __lll_robust_lock_wait\n" \ + "3:\tjmp 18f\n" \ + "4:\t.size _L_robust_lock_%=, 4b-1b\n\t" \ ".previous\n" \ - "1:" \ - : "=a" (_result), "=c" (ignore1), "=&d" (ignore2), \ - "=m" (futex) \ - : "0" (0), "1" (1), "m" (futex), "m" (timeout) \ + LLL_STUB_UNWIND_INFO_4 \ + "18:" \ + : "=a" (__result), "=c" (ignore1), "=m" (futex), \ + "=&d" (ignore2) \ + : "0" (0), "1" (id), "m" (futex), "g" ((int) (private))\ : "memory"); \ - _result; }) - - -#define lll_mutex_unlock(futex) \ - (void) ({ int ignore; \ - __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" \ - "_L_mutex_unlock_%=:\n\t" \ - "leal %0, %%eax\n\t" \ - "call __lll_mutex_unlock_wake\n\t" \ - "jmp 1f\n\t" \ - ".size _L_mutex_unlock_%=,.-_L_mutex_unlock_%=\n" \ - ".previous\n" \ - "1:" \ - : "=m" (futex), "=&a" (ignore) \ - : "m" (futex) \ - : "memory"); }) - - -#define lll_mutex_islocked(futex) \ - (futex != 0) - - -extern int __lll_lock_wait (int val, int *__futex) - __attribute ((regparm (2))) attribute_hidden; -extern int __lll_unlock_wake (int *__futex) - __attribute ((regparm (1))) attribute_hidden; -extern int lll_unlock_wake_cb (int *__futex) attribute_hidden; - + __result; }) -/* The states of a lock are: - 0 - untaken - 1 - taken by one user - 2 - taken by more users */ +/* Special version of lll_lock which causes the unlock function to + always wakeup waiters. */ +#define lll_cond_lock(futex, private) \ + (void) \ + ({ int ignore1, ignore2, ignore3; \ + __asm__ __volatile (LOCK_INSTR "cmpxchgl %1, %2\n\t" \ + "jnz _L_cond_lock_%=\n\t" \ + ".subsection 1\n\t" \ + ".type _L_cond_lock_%=,@function\n" \ + "_L_cond_lock_%=:\n" \ + "1:\tleal %2, %%edx\n" \ + "0:\tmovl %7, %%ecx\n" \ + "2:\tcall __lll_lock_wait\n" \ + "3:\tjmp 18f\n" \ + "4:\t.size _L_cond_lock_%=, 4b-1b\n\t" \ + ".previous\n" \ + LLL_STUB_UNWIND_INFO_4 \ + "18:" \ + : "=a" (ignore1), "=c" (ignore2), "=m" (futex), \ + "=&d" (ignore3) \ + : "0" (0), "1" (2), "m" (futex), "g" ((int) (private))\ + : "memory"); \ + }) + + +#define lll_robust_cond_lock(futex, id, private) \ + ({ int __result, ignore1, ignore2; \ + __asm__ __volatile (LOCK_INSTR "cmpxchgl %1, %2\n\t" \ + "jnz _L_robust_cond_lock_%=\n\t" \ + ".subsection 1\n\t" \ + ".type _L_robust_cond_lock_%=,@function\n" \ + "_L_robust_cond_lock_%=:\n" \ + "1:\tleal %2, %%edx\n" \ + "0:\tmovl %7, %%ecx\n" \ + "2:\tcall __lll_robust_lock_wait\n" \ + "3:\tjmp 18f\n" \ + "4:\t.size _L_robust_cond_lock_%=, 4b-1b\n\t" \ + ".previous\n" \ + LLL_STUB_UNWIND_INFO_4 \ + "18:" \ + : "=a" (__result), "=c" (ignore1), "=m" (futex), \ + "=&d" (ignore2) \ + : "0" (0), "1" (id | FUTEX_WAITERS), "m" (futex), \ + "g" ((int) (private)) \ + : "memory"); \ + __result; }) -#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. */ +#define lll_timedlock(futex, timeout, private) \ + ({ int __result, ignore1, ignore2, ignore3; \ + __asm__ __volatile (LOCK_INSTR "cmpxchgl %1, %3\n\t" \ + "jnz _L_timedlock_%=\n\t" \ + ".subsection 1\n\t" \ + ".type _L_timedlock_%=,@function\n" \ + "_L_timedlock_%=:\n" \ + "1:\tleal %3, %%ecx\n" \ + "0:\tmovl %8, %%edx\n" \ + "2:\tcall __lll_timedlock_wait\n" \ + "3:\tjmp 18f\n" \ + "4:\t.size _L_timedlock_%=, 4b-1b\n\t" \ + ".previous\n" \ + LLL_STUB_UNWIND_INFO_4 \ + "18:" \ + : "=a" (__result), "=c" (ignore1), "=&d" (ignore2), \ + "=m" (futex), "=S" (ignore3) \ + : "0" (0), "1" (1), "m" (futex), "m" (timeout), \ + "4" ((int) (private)) \ + : "memory"); \ + __result; }) -# define lll_trylock(futex) \ - ({ unsigned char ret; \ - __asm__ __volatile ("cmpl $0, %%gs:%P5\n\t" \ - "je,pt 0f\n\t" \ - "lock\n" \ - "0:\tcmpxchgl %2, %1; setne %0" \ - : "=a" (ret), "=m" (futex) \ - : "r" (LLL_MUTEX_LOCK_INITIALIZER_LOCKED), "m" (futex),\ - "0" (LLL_MUTEX_LOCK_INITIALIZER), \ - "i" (offsetof (tcbhead_t, multiple_threads)) \ +#define lll_robust_timedlock(futex, timeout, id, private) \ + ({ int __result, ignore1, ignore2, ignore3; \ + __asm__ __volatile (LOCK_INSTR "cmpxchgl %1, %3\n\t" \ + "jnz _L_robust_timedlock_%=\n\t" \ + ".subsection 1\n\t" \ + ".type _L_robust_timedlock_%=,@function\n" \ + "_L_robust_timedlock_%=:\n" \ + "1:\tleal %3, %%ecx\n" \ + "0:\tmovl %8, %%edx\n" \ + "2:\tcall __lll_robust_timedlock_wait\n" \ + "3:\tjmp 18f\n" \ + "4:\t.size _L_robust_timedlock_%=, 4b-1b\n\t" \ + ".previous\n" \ + LLL_STUB_UNWIND_INFO_4 \ + "18:" \ + : "=a" (__result), "=c" (ignore1), "=&d" (ignore2), \ + "=m" (futex), "=S" (ignore3) \ + : "0" (0), "1" (id), "m" (futex), "m" (timeout), \ + "4" ((int) (private)) \ : "memory"); \ - ret; }) + __result; }) - -# define lll_lock(futex) \ - (void) ({ int ignore1, ignore2; \ - __asm__ __volatile ("cmpl $0, %%gs:%P6\n\t" \ - "je,pt 0f\n\t" \ - "lock\n" \ - "0:\tcmpxchgl %1, %2\n\t" \ - "jnz _L_mutex_lock_%=\n\t" \ - ".subsection 1\n\t" \ - ".type _L_mutex_lock_%=,@function\n" \ - "_L_mutex_lock_%=:\n\t" \ - "leal %2, %%ecx\n\t" \ - "call __lll_mutex_lock_wait\n\t" \ - "jmp 1f\n\t" \ - ".size _L_mutex_lock_%=,.-_L_mutex_lock_%=\n" \ - ".previous\n" \ - "1:" \ - : "=a" (ignore1), "=c" (ignore2), "=m" (futex) \ - : "0" (0), "1" (1), "m" (futex), \ - "i" (offsetof (tcbhead_t, multiple_threads)) \ - : "memory"); }) - - -# define lll_unlock(futex) \ - (void) ({ int ignore; \ - __asm__ __volatile ("cmpl $0, %%gs:%P3\n\t" \ - "je,pt 0f\n\t" \ - "lock\n" \ - "0:\tsubl $1,%0\n\t" \ - "jne _L_mutex_unlock_%=\n\t" \ - ".subsection 1\n\t" \ - ".type _L_mutex_unlock_%=,@function\n" \ - "_L_mutex_unlock_%=:\n\t" \ - "leal %0, %%eax\n\t" \ - "call __lll_mutex_unlock_wake\n\t" \ - "jmp 1f\n\t" \ - ".size _L_mutex_unlock_%=,.-_L_mutex_unlock_%=\n" \ - ".previous\n" \ - "1:" \ - : "=m" (futex), "=&a" (ignore) \ - : "m" (futex), \ - "i" (offsetof (tcbhead_t, multiple_threads)) \ - : "memory"); }) +#if defined NOT_IN_libc || defined UP +# define __lll_unlock_asm LOCK_INSTR "subl $1, %0\n\t" +#else +# define __lll_unlock_asm "cmpl $0, %%gs:%P3\n\t" \ + "je 0f\n\t" \ + "lock\n" \ + "0:\tsubl $1,%0\n\t" #endif +#define lll_unlock(futex, private) \ + (void) \ + ({ int ignore; \ + if (__builtin_constant_p (private) && (private) == LLL_PRIVATE) \ + __asm__ __volatile (__lll_unlock_asm \ + "jne _L_unlock_%=\n\t" \ + ".subsection 1\n\t" \ + ".type _L_unlock_%=,@function\n" \ + "_L_unlock_%=:\n" \ + "1:\tleal %0, %%eax\n" \ + "2:\tcall __lll_unlock_wake_private\n" \ + "3:\tjmp 18f\n" \ + "4:\t.size _L_unlock_%=, 4b-1b\n\t" \ + ".previous\n" \ + LLL_STUB_UNWIND_INFO_3 \ + "18:" \ + : "=m" (futex), "=&a" (ignore) \ + : "m" (futex), "i" (MULTIPLE_THREADS_OFFSET) \ + : "memory"); \ + else \ + { \ + int ignore2; \ + __asm__ __volatile (__lll_unlock_asm \ + "jne _L_unlock_%=\n\t" \ + ".subsection 1\n\t" \ + ".type _L_unlock_%=,@function\n" \ + "_L_unlock_%=:\n" \ + "1:\tleal %0, %%eax\n" \ + "0:\tmovl %5, %%ecx\n" \ + "2:\tcall __lll_unlock_wake\n" \ + "3:\tjmp 18f\n" \ + "4:\t.size _L_unlock_%=, 4b-1b\n\t" \ + ".previous\n" \ + LLL_STUB_UNWIND_INFO_4 \ + "18:" \ + : "=m" (futex), "=&a" (ignore), "=&c" (ignore2) \ + : "i" (MULTIPLE_THREADS_OFFSET), "m" (futex), \ + "g" ((int) (private)) \ + : "memory"); \ + } \ + }) + +#define lll_robust_unlock(futex, private) \ + (void) \ + ({ int ignore, ignore2; \ + __asm__ __volatile (LOCK_INSTR "andl %3, %0\n\t" \ + "jne _L_robust_unlock_%=\n\t" \ + ".subsection 1\n\t" \ + ".type _L_robust_unlock_%=,@function\n" \ + "_L_robust_unlock_%=:\n\t" \ + "1:\tleal %0, %%eax\n" \ + "0:\tmovl %5, %%ecx\n" \ + "2:\tcall __lll_unlock_wake\n" \ + "3:\tjmp 18f\n" \ + "4:\t.size _L_robust_unlock_%=, 4b-1b\n\t" \ + ".previous\n" \ + LLL_STUB_UNWIND_INFO_4 \ + "18:" \ + : "=m" (futex), "=&a" (ignore), "=&c" (ignore2) \ + : "i" (FUTEX_WAITERS), "m" (futex), \ + "g" ((int) (private)) \ + : "memory"); \ + }) + + +#define lll_robust_dead(futex, private) \ + (void) \ + ({ int __ignore; \ + register int _nr __asm__ ("edx") = 1; \ + __asm__ __volatile (LOCK_INSTR "orl %5, (%2)\n\t" \ + LLL_EBX_LOAD \ + LLL_ENTER_KERNEL \ + LLL_EBX_LOAD \ + : "=a" (__ignore) \ + : "0" (SYS_futex), LLL_EBX_REG (&(futex)), \ + "c" (__lll_private_flag (FUTEX_WAKE, private)), \ + "d" (_nr), "i" (FUTEX_OWNER_DIED), \ + "i" (offsetof (tcbhead_t, sysinfo))); \ + }) #define lll_islocked(futex) \ (futex != LLL_LOCK_INITIALIZER) - /* The kernel notifies a process with uses CLONE_CLEARTID via futex wakeup when the clone terminates. The memory location contains the thread ID while the clone is running and is reset to zero @@ -308,21 +548,22 @@ extern int lll_unlock_wake_cb (int *__futex) attribute_hidden; The macro parameter must not have any side effect. */ #define lll_wait_tid(tid) \ - ({ \ - int __ret; \ - register __typeof (tid) _tid __asm__ ("edx") = (tid); \ + do { \ + int __ignore; \ + register __typeof (tid) _tid __asm__ ("edx") = (tid); \ if (_tid != 0) \ __asm__ __volatile (LLL_EBX_LOAD \ "1:\tmovl %1, %%eax\n\t" \ LLL_ENTER_KERNEL \ "cmpl $0, (%%ebx)\n\t" \ - "jne,pn 1b\n\t" \ + "jne 1b\n\t" \ LLL_EBX_LOAD \ - : "=&a" (__ret) \ + : "=&a" (__ignore) \ : "i" (SYS_futex), LLL_EBX_REG (&tid), "S" (0), \ "c" (FUTEX_WAIT), "d" (_tid), \ - "i" (offsetof (tcbhead_t, sysinfo))); \ - __ret; }) + "i" (offsetof (tcbhead_t, sysinfo)) \ + : "memory"); \ + } while (0) extern int __lll_timedwait_tid (int *tid, const struct timespec *abstime) __attribute__ ((regparm (2))) attribute_hidden; @@ -338,28 +579,6 @@ extern int __lll_timedwait_tid (int *tid, const struct timespec *abstime) } \ __result; }) - -/* Conditional variable handling. */ - -extern void __lll_cond_wait (pthread_cond_t *cond) - __attribute ((regparm (1))) attribute_hidden; -extern int __lll_cond_timedwait (pthread_cond_t *cond, - const struct timespec *abstime) - __attribute ((regparm (2))) attribute_hidden; -extern void __lll_cond_wake (pthread_cond_t *cond) - __attribute ((regparm (1))) attribute_hidden; -extern void __lll_cond_broadcast (pthread_cond_t *cond) - __attribute ((regparm (1))) attribute_hidden; - - -#define lll_cond_wait(cond) \ - __lll_cond_wait (cond) -#define lll_cond_timedwait(cond, abstime) \ - __lll_cond_timedwait (cond, abstime) -#define lll_cond_wake(cond) \ - __lll_cond_wake (cond) -#define lll_cond_broadcast(cond) \ - __lll_cond_broadcast (cond) - +#endif /* !__ASSEMBLER__ */ #endif /* lowlevellock.h */ |