lowlevellock.h

glibc 2.9,最新版的C语言库函数

			   "4:\taddq $128, %%rsp\n"			      \
			   "5:\tjmp 24f\n"				      \
			   "6:\t.size _L_lock_%=, 6b-1b\n\t"		      \
			   ".previous\n"				      \
			   LLL_STUB_UNWIND_INFO_5			      \
			   "24:"					      \
			   : "=S" (ignore1), "=&D" (ignore2), "=m" (futex),   \
			     "=a" (ignore3)				      \
			   : "0" (1), "m" (futex), "3" (0)		      \
			   : "cx", "r11", "cc", "memory");		      \
       else								      \
	 __asm __volatile (__lll_lock_asm_start				      \
			   ".subsection 1\n\t"				      \
			   ".type _L_lock_%=, @function\n"		      \
			   "_L_lock_%=:\n"				      \
			   "1:\tleaq %2, %%rdi\n"			      \
			   "2:\tsubq $128, %%rsp\n"			      \
			   "3:\tcallq __lll_lock_wait\n"		      \
			   "4:\taddq $128, %%rsp\n"			      \
			   "5:\tjmp 24f\n"				      \
			   "6:\t.size _L_lock_%=, 6b-1b\n\t"		      \
			   ".previous\n"				      \
			   LLL_STUB_UNWIND_INFO_5			      \
			   "24:"					      \
			   : "=S" (ignore1), "=D" (ignore2), "=m" (futex),    \
			     "=a" (ignore3)				      \
			   : "1" (1), "m" (futex), "3" (0), "0" (private)     \
			   : "cx", "r11", "cc", "memory");		      \
    })									      \

#define lll_robust_lock(futex, id, private) \
  ({ int result, ignore1, ignore2;					      \
    __asm __volatile (LOCK_INSTR "cmpxchgl %4, %2\n\t"			      \
		      "jnz 1f\n\t"					      \
		      ".subsection 1\n\t"				      \
		      ".type _L_robust_lock_%=, @function\n"		      \
		      "_L_robust_lock_%=:\n"				      \
		      "1:\tleaq %2, %%rdi\n"				      \
		      "2:\tsubq $128, %%rsp\n"				      \
		      "3:\tcallq __lll_robust_lock_wait\n"		      \
		      "4:\taddq $128, %%rsp\n"				      \
		      "5:\tjmp 24f\n"					      \
		      "6:\t.size _L_robust_lock_%=, 6b-1b\n\t"		      \
		      ".previous\n"					      \
		      LLL_STUB_UNWIND_INFO_5				      \
		      "24:"						      \
		      : "=S" (ignore1), "=D" (ignore2), "=m" (futex),	      \
			"=a" (result)					      \
		      : "1" (id), "m" (futex), "3" (0), "0" (private)	      \
		      : "cx", "r11", "cc", "memory");			      \
    result; })

#define lll_cond_lock(futex, private) \
  (void)								      \
    ({ int ignore1, ignore2, ignore3;					      \
       __asm __volatile (LOCK_INSTR "cmpxchgl %4, %2\n\t"		      \
			 "jnz 1f\n\t"					      \
			 ".subsection 1\n\t"				      \
			 ".type _L_cond_lock_%=, @function\n"		      \
			 "_L_cond_lock_%=:\n"				      \
			 "1:\tleaq %2, %%rdi\n"				      \
			 "2:\tsubq $128, %%rsp\n"			      \
			 "3:\tcallq __lll_lock_wait\n"			      \
			 "4:\taddq $128, %%rsp\n"			      \
			 "5:\tjmp 24f\n"				      \
			 "6:\t.size _L_cond_lock_%=, 6b-1b\n\t"		      \
			 ".previous\n"					      \
			 LLL_STUB_UNWIND_INFO_5				      \
			 "24:"						      \
			 : "=S" (ignore1), "=D" (ignore2), "=m" (futex),      \
			   "=a" (ignore3)				      \
			 : "1" (2), "m" (futex), "3" (0), "0" (private)	      \
			 : "cx", "r11", "cc", "memory");		      \
    })

#define lll_robust_cond_lock(futex, id, private) \
  ({ int result, ignore1, ignore2;					      \
    __asm __volatile (LOCK_INSTR "cmpxchgl %4, %2\n\t"			      \
		      "jnz 1f\n\t"					      \
		      ".subsection 1\n\t"				      \
		      ".type _L_robust_cond_lock_%=, @function\n"	      \
		      "_L_robust_cond_lock_%=:\n"			      \
		      "1:\tleaq %2, %%rdi\n"				      \
		      "2:\tsubq $128, %%rsp\n"				      \
		      "3:\tcallq __lll_robust_lock_wait\n"		      \
		      "4:\taddq $128, %%rsp\n"				      \
		      "5:\tjmp 24f\n"					      \
		      "6:\t.size _L_robust_cond_lock_%=, 6b-1b\n\t"	      \
		      ".previous\n"					      \
		      LLL_STUB_UNWIND_INFO_5				      \
		      "24:"						      \
		      : "=S" (ignore1), "=D" (ignore2), "=m" (futex),	      \
			"=a" (result)					      \
		      : "1" (id | FUTEX_WAITERS), "m" (futex), "3" (0),	      \
			"0" (private)					      \
		      : "cx", "r11", "cc", "memory");			      \
    result; })

#define lll_timedlock(futex, timeout, private) \
  ({ int result, ignore1, ignore2, ignore3;				      \
     __asm __volatile (LOCK_INSTR "cmpxchgl %1, %4\n\t"			      \
		       "jnz 1f\n\t"					      \
		       ".subsection 1\n\t"				      \
		       ".type _L_timedlock_%=, @function\n"		      \
		       "_L_timedlock_%=:\n"				      \
		       "1:\tleaq %4, %%rdi\n"				      \
		       "0:\tmovq %8, %%rdx\n"				      \
		       "2:\tsubq $128, %%rsp\n"				      \
		       "3:\tcallq __lll_timedlock_wait\n"		      \
		       "4:\taddq $128, %%rsp\n"				      \
		       "5:\tjmp 24f\n"					      \
		       "6:\t.size _L_timedlock_%=, 6b-1b\n\t"		      \
		       ".previous\n"					      \
		       LLL_STUB_UNWIND_INFO_6				      \
		       "24:"						      \
		       : "=a" (result), "=D" (ignore1), "=S" (ignore2),	      \
			 "=&d" (ignore3), "=m" (futex)			      \
		       : "0" (0), "1" (1), "m" (futex), "m" (timeout),	      \
			 "2" (private)					      \
		       : "memory", "cx", "cc", "r10", "r11");		      \
     result; })

#define lll_robust_timedlock(futex, timeout, id, private) \
  ({ int result, ignore1, ignore2, ignore3;				      \
     __asm __volatile (LOCK_INSTR "cmpxchgl %1, %4\n\t"			      \
		       "jnz 1f\n\t"					      \
		       ".subsection 1\n\t"				      \
		       ".type _L_robust_timedlock_%=, @function\n"	      \
		       "_L_robust_timedlock_%=:\n"			      \
		       "1:\tleaq %4, %%rdi\n"				      \
		       "0:\tmovq %8, %%rdx\n"				      \
		       "2:\tsubq $128, %%rsp\n"				      \
		       "3:\tcallq __lll_robust_timedlock_wait\n"	      \
		       "4:\taddq $128, %%rsp\n"				      \
		       "5:\tjmp 24f\n"					      \
		       "6:\t.size _L_robust_timedlock_%=, 6b-1b\n\t"	      \
		       ".previous\n"					      \
		       LLL_STUB_UNWIND_INFO_6				      \
		       "24:"						      \
		       : "=a" (result), "=D" (ignore1), "=S" (ignore2),       \
			 "=&d" (ignore3), "=m" (futex)			      \
		       : "0" (0), "1" (id), "m" (futex), "m" (timeout),	      \
			 "2" (private)					      \
		       : "memory", "cx", "cc", "r10", "r11");		      \
     result; })

#if defined NOT_IN_libc || defined UP
# define __lll_unlock_asm_start LOCK_INSTR "decl %0\n\t"		      \
				"jne 1f\n\t"
#else
# define __lll_unlock_asm_start "cmpl $0, __libc_multiple_threads(%%rip)\n\t" \
				"je 0f\n\t"				      \
				"lock; decl %0\n\t"			      \
				"jne 1f\n\t"				      \
				"jmp 24f\n\t"				      \
				"0:\tdecl %0\n\t"			      \
				"jne 1f\n\t"
#endif

#define lll_unlock(futex, private) \
  (void)								      \
    ({ int ignore;							      \
       if (__builtin_constant_p (private) && (private) == LLL_PRIVATE)	      \
	 __asm __volatile (__lll_unlock_asm_start			      \
			   ".subsection 1\n\t"				      \
			   ".type _L_unlock_%=, @function\n"		      \
			   "_L_unlock_%=:\n"				      \
			   "1:\tleaq %0, %%rdi\n"			      \
			   "2:\tsubq $128, %%rsp\n"			      \
			   "3:\tcallq __lll_unlock_wake_private\n"	      \
			   "4:\taddq $128, %%rsp\n"			      \
			   "5:\tjmp 24f\n"				      \
			   "6:\t.size _L_unlock_%=, 6b-1b\n\t"		      \
			   ".previous\n"				      \
			   LLL_STUB_UNWIND_INFO_5			      \
			   "24:"					      \
			   : "=m" (futex), "=&D" (ignore)		      \
			   : "m" (futex)				      \
			   : "ax", "cx", "r11", "cc", "memory");	      \
       else								      \
	 __asm __volatile (__lll_unlock_asm_start			      \
			   ".subsection 1\n\t"				      \
			   ".type _L_unlock_%=, @function\n"		      \
			   "_L_unlock_%=:\n"				      \
			   "1:\tleaq %0, %%rdi\n"			      \
			   "2:\tsubq $128, %%rsp\n"			      \
			   "3:\tcallq __lll_unlock_wake\n"		      \
			   "4:\taddq $128, %%rsp\n"			      \
			   "5:\tjmp 24f\n"				      \
			   "6:\t.size _L_unlock_%=, 6b-1b\n\t"		      \
			   ".previous\n"				      \
			   LLL_STUB_UNWIND_INFO_5			      \
			   "24:"					      \
			   : "=m" (futex), "=&D" (ignore)		      \
			   : "m" (futex), "S" (private)			      \
			   : "ax", "cx", "r11", "cc", "memory");	      \
    })

#define lll_robust_unlock(futex, private) \
  do									      \
    {									      \
      int ignore;							      \
      __asm __volatile (LOCK_INSTR "andl %2, %0\n\t"			      \
			"jne 1f\n\t"					      \
			".subsection 1\n\t"				      \
			".type _L_robust_unlock_%=, @function\n"	      \
			"_L_robust_unlock_%=:\n"			      \
			"1:\tleaq %0, %%rdi\n"				      \
			"2:\tsubq $128, %%rsp\n"			      \
			"3:\tcallq __lll_unlock_wake\n"			      \
			"4:\taddq $128, %%rsp\n"			      \
			"5:\tjmp 24f\n"					      \
			"6:\t.size _L_robust_unlock_%=, 6b-1b\n\t"	      \
			".previous\n"					      \
			LLL_STUB_UNWIND_INFO_5				      \
			"24:"						      \
			: "=m" (futex), "=&D" (ignore)			      \
			: "i" (FUTEX_WAITERS), "m" (futex),		      \
			  "S" (private)					      \
			: "ax", "cx", "r11", "cc", "memory");		      \
    }									      \
  while (0)

#define lll_robust_dead(futex, private) \
  do									      \
    {									      \
      int ignore;							      \
      __asm __volatile (LOCK_INSTR "orl %3, (%2)\n\t"			      \
			"syscall"					      \
			: "=m" (futex), "=a" (ignore)			      \
			: "D" (&(futex)), "i" (FUTEX_OWNER_DIED),	      \
			  "S" (__lll_private_flag (FUTEX_WAKE, private)),     \
			  "1" (__NR_futex), "d" (1)			      \
			: "cx", "r11", "cc", "memory");			      \
    }									      \
  while (0)

/* Returns non-zero if error happened, zero if success.  */
#define lll_futex_requeue(ftx, nr_wake, nr_move, mutex, val, private) \
  ({ int __res;								      \
     register int __nr_move __asm ("r10") = nr_move;			      \
     register void *__mutex __asm ("r8") = mutex;			      \
     register int __val __asm ("r9") = val;				      \
     __asm __volatile ("syscall"					      \
		       : "=a" (__res)					      \
		       : "0" (__NR_futex), "D" ((void *) ftx),		      \
			 "S" (__lll_private_flag (FUTEX_CMP_REQUEUE,	      \
						  private)), "d" (nr_wake),   \
			 "r" (__nr_move), "r" (__mutex), "r" (__val)	      \
		       : "cx", "r11", "cc", "memory");			      \
     __res < 0; })

#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
   afterwards.

   The macro parameter must not have any side effect.  */
#define lll_wait_tid(tid) \
  do {									      \
    int __ignore;							      \
    register __typeof (tid) _tid asm ("edx") = (tid);			      \
    if (_tid != 0)							      \
      __asm __volatile ("xorq %%r10, %%r10\n\t"				      \
			"1:\tmovq %2, %%rax\n\t"			      \
			"syscall\n\t"					      \
			"cmpl $0, (%%rdi)\n\t"				      \
			"jne 1b"					      \
			: "=&a" (__ignore)				      \
			: "S" (FUTEX_WAIT), "i" (SYS_futex), "D" (&tid),      \
			  "d" (_tid)					      \
			: "memory", "cc", "r10", "r11", "cx");		      \
  } while (0)

extern int __lll_timedwait_tid (int *tid, const struct timespec *abstime)
     attribute_hidden;
#define lll_timedwait_tid(tid, abstime) \
  ({									      \
    int __result = 0;							      \
    if (tid != 0)							      \
      {									      \
	if (abstime->tv_nsec < 0 || abstime->tv_nsec >= 1000000000)	      \
	  __result = EINVAL;						      \
	else								      \
	  __result = __lll_timedwait_tid (&tid, abstime);		      \
      }									      \
    __result; })

#endif  /* !__ASSEMBLER__ */

#endif	/* lowlevellock.h */