?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
2006-03-04 Jakub Jelinek <jakub@redhat.com>
[glibc.git] / nptl / sysdeps / unix / sysv / linux / i386 / lowlevellock.h
blob21de09fe912ee30c16b25b1ee4a3570a2fba9a3e
1 /* Copyright (C) 2002, 2003, 2004, 2006 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, write to the Free
17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
18 02111-1307 USA. */
19
20 #ifndef _LOWLEVELLOCK_H
21 #define _LOWLEVELLOCK_H 1
22
23 #include <time.h>
24 #include <sys/param.h>
25 #include <bits/pthreadtypes.h>
26
27 #ifndef LOCK_INSTR
28 # ifdef UP
29 # define LOCK_INSTR /* nothing */
30 # else
31 # define LOCK_INSTR "lock;"
32 # endif
33 #endif
34
35 #define SYS_futex 240
36 #define FUTEX_WAIT 0
37 #define FUTEX_WAKE 1
38 #define FUTEX_LOCK_PI 6
39 #define FUTEX_UNLOCK_PI 7
40 #define FUTEX_TRYLOCK_PI 8
41
42
43 /* Initializer for compatibility lock. */
44 #define LLL_MUTEX_LOCK_INITIALIZER (0)
45 #define LLL_MUTEX_LOCK_INITIALIZER_LOCKED (1)
46 #define LLL_MUTEX_LOCK_INITIALIZER_WAITERS (2)
47
48
49 #ifdef PIC
50 # define LLL_EBX_LOAD "xchgl %2, %%ebx\n"
51 # define LLL_EBX_REG "D"
52 #else
53 # define LLL_EBX_LOAD
54 # define LLL_EBX_REG "b"
55 #endif
56
57 #ifdef I386_USE_SYSENTER
58 # ifdef SHARED
59 # define LLL_ENTER_KERNEL "call *%%gs:%P6\n\t"
60 # else
61 # define LLL_ENTER_KERNEL "call *_dl_sysinfo\n\t"
62 # endif
63 #else
64 # define LLL_ENTER_KERNEL "int $0x80\n\t"
65 #endif
66
67 /* Delay in spinlock loop. */
68 #define BUSY_WAIT_NOP asm ("rep; nop")
69
70
71 #define LLL_STUB_UNWIND_INFO_START \
72 ".section .eh_frame,\"a\",@progbits\n" \
73 "5:\t" ".long 7f-6f # Length of Common Information Entry\n" \
74 "6:\t" ".long 0x0 # CIE Identifier Tag\n\t" \
75 ".byte 0x1 # CIE Version\n\t" \
76 ".ascii \"zR\\0\" # CIE Augmentation\n\t" \
77 ".uleb128 0x1 # CIE Code Alignment Factor\n\t" \
78 ".sleb128 -4 # CIE Data Alignment Factor\n\t" \
79 ".byte 0x8 # CIE RA Column\n\t" \
80 ".uleb128 0x1 # Augmentation size\n\t" \
81 ".byte 0x1b # FDE Encoding (pcrel sdata4)\n\t" \
82 ".byte 0xc # DW_CFA_def_cfa\n\t" \
83 ".uleb128 0x4\n\t" \
84 ".uleb128 0x0\n\t" \
85 ".align 4\n" \
86 "7:\t" ".long 17f-8f # FDE Length\n" \
87 "8:\t" ".long 8b-5b # FDE CIE offset\n\t" \
88 ".long 1b-. # FDE initial location\n\t" \
89 ".long 4b-1b # FDE address range\n\t" \
90 ".uleb128 0x0 # Augmentation size\n\t" \
91 ".byte 0x16 # DW_CFA_val_expression\n\t" \
92 ".uleb128 0x8\n\t" \
93 ".uleb128 10f-9f\n" \
94 "9:\t" ".byte 0x78 # DW_OP_breg8\n\t" \
95 ".sleb128 3b-1b\n"
96 #define LLL_STUB_UNWIND_INFO_END \
97 ".byte 0x16 # DW_CFA_val_expression\n\t" \
98 ".uleb128 0x8\n\t" \
99 ".uleb128 12f-11f\n" \
100 "11:\t" ".byte 0x78 # DW_OP_breg8\n\t" \
101 ".sleb128 3b-2b\n" \
102 "12:\t" ".byte 0x40 + (3b-2b-1) # DW_CFA_advance_loc\n\t" \
103 ".byte 0x16 # DW_CFA_val_expression\n\t" \
104 ".uleb128 0x8\n\t" \
105 ".uleb128 16f-13f\n" \
106 "13:\t" ".byte 0x78 # DW_OP_breg8\n\t" \
107 ".sleb128 15f-14f\n\t" \
108 ".byte 0x0d # DW_OP_const4s\n" \
109 "14:\t" ".4byte 3b-.\n\t" \
110 ".byte 0x1c # DW_OP_minus\n\t" \
111 ".byte 0x0d # DW_OP_const4s\n" \
112 "15:\t" ".4byte 18f-.\n\t" \
113 ".byte 0x22 # DW_OP_plus\n" \
114 "16:\t" ".align 4\n" \
115 "17:\t" ".previous\n"
116
117 /* Unwind info for
118 1: lea ..., ...
119 2: call ...
120 3: jmp 18f
121 4:
122 snippet. */
123 #define LLL_STUB_UNWIND_INFO_3 \
124 LLL_STUB_UNWIND_INFO_START \
125 "10:\t" ".byte 0x40 + (2b-1b) # DW_CFA_advance_loc\n\t" \
126 LLL_STUB_UNWIND_INFO_END
127
128 /* Unwind info for
129 1: lea ..., ...
130 0: movl ..., ...
131 2: call ...
132 3: jmp 18f
133 4:
134 snippet. */
135 #define LLL_STUB_UNWIND_INFO_4 \
136 LLL_STUB_UNWIND_INFO_START \
137 "10:\t" ".byte 0x40 + (0b-1b) # DW_CFA_advance_loc\n\t" \
138 ".byte 0x16 # DW_CFA_val_expression\n\t" \
139 ".uleb128 0x8\n\t" \
140 ".uleb128 20f-19f\n" \
141 "19:\t" ".byte 0x78 # DW_OP_breg8\n\t" \
142 ".sleb128 3b-0b\n" \
143 "20:\t" ".byte 0x40 + (2b-0b) # DW_CFA_advance_loc\n\t" \
144 LLL_STUB_UNWIND_INFO_END
145
146
147 #define lll_futex_wait(futex, val) \
148 ({ \
149 int __status; \
150 register __typeof (val) _val asm ("edx") = (val); \
151 __asm __volatile (LLL_EBX_LOAD \
152 LLL_ENTER_KERNEL \
153 LLL_EBX_LOAD \
154 : "=a" (__status) \
155 : "0" (SYS_futex), LLL_EBX_REG (futex), "S" (0), \
156 "c" (FUTEX_WAIT), "d" (_val), \
157 "i" (offsetof (tcbhead_t, sysinfo)) \
158 : "memory"); \
159 __status; \
160 })
161
162
163 #define lll_futex_timed_wait(futex, val, timeout) \
164 ({ \
165 int __status; \
166 register __typeof (val) _val asm ("edx") = (val); \
167 __asm __volatile (LLL_EBX_LOAD \
168 LLL_ENTER_KERNEL \
169 LLL_EBX_LOAD \
170 : "=a" (__status) \
171 : "0" (SYS_futex), LLL_EBX_REG (futex), "S" (timeout), \
172 "c" (FUTEX_WAIT), "d" (_val), \
173 "i" (offsetof (tcbhead_t, sysinfo)) \
174 : "memory"); \
175 __status; \
176 })
177
178
179 #define lll_futex_wake(futex, nr) \
180 do { \
181 int __ignore; \
182 register __typeof (nr) _nr asm ("edx") = (nr); \
183 __asm __volatile (LLL_EBX_LOAD \
184 LLL_ENTER_KERNEL \
185 LLL_EBX_LOAD \
186 : "=a" (__ignore) \
187 : "0" (SYS_futex), LLL_EBX_REG (futex), \
188 "c" (FUTEX_WAKE), "d" (_nr), \
189 "i" (0) /* phony, to align next arg's number */, \
190 "i" (offsetof (tcbhead_t, sysinfo))); \
191 } while (0)
192
193
194 /* Does not preserve %eax and %ecx. */
195 extern int __lll_mutex_lock_wait (int val, int *__futex)
196 __attribute ((regparm (2))) attribute_hidden;
197 /* Does not preserve %eax, %ecx, and %edx. */
198 extern int __lll_mutex_timedlock_wait (int val, int *__futex,
199 const struct timespec *abstime)
200 __attribute ((regparm (3))) attribute_hidden;
201 /* Preserves all registers but %eax. */
202 extern int __lll_mutex_unlock_wake (int *__futex)
203 __attribute ((regparm (1))) attribute_hidden;
204
205
206 /* NB: in the lll_mutex_trylock macro we simply return the value in %eax
207 after the cmpxchg instruction. In case the operation succeded this
208 value is zero. In case the operation failed, the cmpxchg instruction
209 has loaded the current value of the memory work which is guaranteed
210 to be nonzero. */
211 #define lll_mutex_trylock(futex) \
212 ({ int ret; \
213 __asm __volatile (LOCK_INSTR "cmpxchgl %2, %1" \
214 : "=a" (ret), "=m" (futex) \
215 : "r" (LLL_MUTEX_LOCK_INITIALIZER_LOCKED), "m" (futex),\
216 "0" (LLL_MUTEX_LOCK_INITIALIZER) \
217 : "memory"); \
218 ret; })
219
220
221 #define lll_robust_mutex_trylock(futex, id) \
222 ({ int ret; \
223 __asm __volatile (LOCK_INSTR "cmpxchgl %2, %1" \
224 : "=a" (ret), "=m" (futex) \
225 : "r" (id), "m" (futex), \
226 "0" (LLL_MUTEX_LOCK_INITIALIZER) \
227 : "memory"); \
228 ret; })
229
230
231 #define lll_mutex_cond_trylock(futex) \
232 ({ int ret; \
233 __asm __volatile (LOCK_INSTR "cmpxchgl %2, %1" \
234 : "=a" (ret), "=m" (futex) \
235 : "r" (LLL_MUTEX_LOCK_INITIALIZER_WAITERS), \
236 "m" (futex), "0" (LLL_MUTEX_LOCK_INITIALIZER) \
237 : "memory"); \
238 ret; })
239
240
241 #define lll_mutex_lock(futex) \
242 (void) ({ int ignore1, ignore2; \
243 __asm __volatile (LOCK_INSTR "cmpxchgl %1, %2\n\t" \
244 "jnz _L_mutex_lock_%=\n\t" \
245 ".subsection 1\n\t" \
246 ".type _L_mutex_lock_%=,@function\n" \
247 "_L_mutex_lock_%=:\n" \
248 "1:\tleal %2, %%ecx\n" \
249 "2:\tcall __lll_mutex_lock_wait\n" \
250 "3:\tjmp 18f\n" \
251 "4:\t.size _L_mutex_lock_%=, 4b-1b\n\t" \
252 ".previous\n" \
253 LLL_STUB_UNWIND_INFO_3 \
254 "18:" \
255 : "=a" (ignore1), "=c" (ignore2), "=m" (futex) \
256 : "0" (0), "1" (1), "m" (futex) \
257 : "memory"); })
258
259
260 #define lll_robust_mutex_lock(futex, id) \
261 ({ int result, ignore; \
262 __asm __volatile (LOCK_INSTR "cmpxchgl %1, %2\n\t" \
263 "jnz _L_robust_mutex_lock_%=\n\t" \
264 ".subsection 1\n\t" \
265 ".type _L_robust_mutex_lock_%=,@function\n" \
266 "_L_robust_mutex_lock_%=:\n" \
267 "1:\tleal %2, %%ecx\n" \
268 "2:\tcall __lll_robust_mutex_lock_wait\n" \
269 "3:\tjmp 18f\n" \
270 "4:\t.size _L_robust_mutex_lock_%=, 4b-1b\n\t" \
271 ".previous\n" \
272 LLL_STUB_UNWIND_INFO_3 \
273 "18:" \
274 : "=a" (result), "=c" (ignore), "=m" (futex) \
275 : "0" (0), "1" (id), "m" (futex) \
276 : "memory"); \
277 result; })
278
279
280 /* Special version of lll_mutex_lock which causes the unlock function to
281 always wakeup waiters. */
282 #define lll_mutex_cond_lock(futex) \
283 (void) ({ int ignore1, ignore2; \
284 __asm __volatile (LOCK_INSTR "cmpxchgl %1, %2\n\t" \
285 "jnz _L_mutex_cond_lock_%=\n\t" \
286 ".subsection 1\n\t" \
287 ".type _L_mutex_cond_lock_%=,@function\n" \
288 "_L_mutex_cond_lock_%=:\n" \
289 "1:\tleal %2, %%ecx\n" \
290 "2:\tcall __lll_mutex_lock_wait\n" \
291 "3:\tjmp 18f\n" \
292 "4:\t.size _L_mutex_cond_lock_%=, 4b-1b\n\t" \
293 ".previous\n" \
294 LLL_STUB_UNWIND_INFO_3 \
295 "18:" \
296 : "=a" (ignore1), "=c" (ignore2), "=m" (futex) \
297 : "0" (0), "1" (2), "m" (futex) \
298 : "memory"); })
299
300
301 #define lll_robust_mutex_cond_lock(futex, id) \
302 ({ int result, ignore; \
303 __asm __volatile (LOCK_INSTR "cmpxchgl %1, %2\n\t" \
304 "jnz _L_robust_mutex_cond_lock_%=\n\t" \
305 ".subsection 1\n\t" \
306 ".type _L_robust_mutex_cond_lock_%=,@function\n" \
307 "_L_robust_mutex_cond_lock_%=:\n" \
308 "1:\tleal %2, %%ecx\n" \
309 "2:\tcall __lll_robust_mutex_lock_wait\n" \
310 "3:\tjmp 18f\n" \
311 "4:\t.size _L_robust_mutex_cond_lock_%=, 4b-1b\n\t" \
312 ".previous\n" \
313 LLL_STUB_UNWIND_INFO_3 \
314 "18:" \
315 : "=a" (result), "=c" (ignore), "=m" (futex) \
316 : "0" (0), "1" (id | FUTEX_WAITERS), "m" (futex) \
317 : "memory"); \
318 result; })
319
320
321 #define lll_mutex_timedlock(futex, timeout) \
322 ({ int result, ignore1, ignore2; \
323 __asm __volatile (LOCK_INSTR "cmpxchgl %1, %3\n\t" \
324 "jnz _L_mutex_timedlock_%=\n\t" \
325 ".subsection 1\n\t" \
326 ".type _L_mutex_timedlock_%=,@function\n" \
327 "_L_mutex_timedlock_%=:\n" \
328 "1:\tleal %3, %%ecx\n" \
329 "0:\tmovl %7, %%edx\n" \
330 "2:\tcall __lll_mutex_timedlock_wait\n" \
331 "3:\tjmp 18f\n" \
332 "4:\t.size _L_mutex_timedlock_%=, 4b-1b\n\t" \
333 ".previous\n" \
334 LLL_STUB_UNWIND_INFO_4 \
335 "18:" \
336 : "=a" (result), "=c" (ignore1), "=&d" (ignore2), \
337 "=m" (futex) \
338 : "0" (0), "1" (1), "m" (futex), "m" (timeout) \
339 : "memory"); \
340 result; })
341
342
343 #define lll_robust_mutex_timedlock(futex, timeout, id) \
344 ({ int result, ignore1, ignore2; \
345 __asm __volatile (LOCK_INSTR "cmpxchgl %1, %3\n\t" \
346 "jnz _L_robust_mutex_timedlock_%=\n\t" \
347 ".subsection 1\n\t" \
348 ".type _L_robust_mutex_timedlock_%=,@function\n" \
349 "_L_robust_mutex_timedlock_%=:\n" \
350 "1:\tleal %3, %%ecx\n" \
351 "0:\tmovl %7, %%edx\n" \
352 "2:\tcall __lll_robust_mutex_timedlock_wait\n" \
353 "3:\tjmp 18f\n" \
354 "4:\t.size _L_robust_mutex_timedlock_%=, 4b-1b\n\t" \
355 ".previous\n" \
356 LLL_STUB_UNWIND_INFO_4 \
357 "18:" \
358 : "=a" (result), "=c" (ignore1), "=&d" (ignore2), \
359 "=m" (futex) \
360 : "0" (0), "1" (id), "m" (futex), "m" (timeout) \
361 : "memory"); \
362 result; })
363
364
365 #define lll_mutex_unlock(futex) \
366 (void) ({ int ignore; \
367 __asm __volatile (LOCK_INSTR "subl $1, %0\n\t" \
368 "jne _L_mutex_unlock_%=\n\t" \
369 ".subsection 1\n\t" \
370 ".type _L_mutex_unlock_%=,@function\n" \
371 "_L_mutex_unlock_%=:\n" \
372 "1:\tleal %0, %%eax\n" \
373 "2:\tcall __lll_mutex_unlock_wake\n" \
374 "3:\tjmp 18f\n" \
375 "4:\t.size _L_mutex_unlock_%=, 4b-1b\n\t" \
376 ".previous\n" \
377 LLL_STUB_UNWIND_INFO_3 \
378 "18:" \
379 : "=m" (futex), "=&a" (ignore) \
380 : "m" (futex) \
381 : "memory"); })
382
383
384 #define lll_robust_mutex_unlock(futex) \
385 (void) ({ int ignore; \
386 __asm __volatile (LOCK_INSTR "andl %2, %0\n\t" \
387 "jne _L_robust_mutex_unlock_%=\n\t" \
388 ".subsection 1\n\t" \
389 ".type _L_robust_mutex_unlock_%=,@function\n" \
390 "_L_robust_mutex_unlock_%=:\n\t" \
391 "1:\tleal %0, %%eax\n" \
392 "2:\tcall __lll_mutex_unlock_wake\n" \
393 "3:\tjmp 18f\n" \
394 "4:\t.size _L_robust_mutex_unlock_%=, 4b-1b\n\t"\
395 ".previous\n" \
396 LLL_STUB_UNWIND_INFO_3 \
397 "18:" \
398 : "=m" (futex), "=&a" (ignore) \
399 : "i" (FUTEX_WAITERS), "m" (futex) \
400 : "memory"); })
401
402
403 #define lll_robust_mutex_dead(futex) \
404 (void) ({ int __ignore; \
405 register int _nr asm ("edx") = 1; \
406 __asm __volatile (LOCK_INSTR "orl %5, (%2)\n\t" \
407 LLL_EBX_LOAD \
408 LLL_ENTER_KERNEL \
409 LLL_EBX_LOAD \
410 : "=a" (__ignore) \
411 : "0" (SYS_futex), LLL_EBX_REG (&(futex)), \
412 "c" (FUTEX_WAKE), "d" (_nr), \
413 "i" (FUTEX_OWNER_DIED), \
414 "i" (offsetof (tcbhead_t, sysinfo))); })
415
416
417 #define lll_futex_wake(futex, nr) \
418 do { \
419 int __ignore; \
420 register __typeof (nr) _nr asm ("edx") = (nr); \
421 __asm __volatile (LLL_EBX_LOAD \
422 LLL_ENTER_KERNEL \
423 LLL_EBX_LOAD \
424 : "=a" (__ignore) \
425 : "0" (SYS_futex), LLL_EBX_REG (futex), \
426 "c" (FUTEX_WAKE), "d" (_nr), \
427 "i" (0) /* phony, to align next arg's number */, \
428 "i" (offsetof (tcbhead_t, sysinfo))); \
429 } while (0)
430
431
432 #define lll_mutex_islocked(futex) \
433 (futex != 0)
434
435
436 /* We have a separate internal lock implementation which is not tied
437 to binary compatibility. */
438
439 /* Type for lock object. */
440 typedef int lll_lock_t;
441
442 /* Initializers for lock. */
443 #define LLL_LOCK_INITIALIZER (0)
444 #define LLL_LOCK_INITIALIZER_LOCKED (1)
445
446
447 extern int __lll_lock_wait (int val, int *__futex)
448 __attribute ((regparm (2))) attribute_hidden;
449 extern int __lll_unlock_wake (int *__futex)
450 __attribute ((regparm (1))) attribute_hidden;
451 extern int lll_unlock_wake_cb (int *__futex) attribute_hidden;
452
453
454 /* The states of a lock are:
455 0 - untaken
456 1 - taken by one user
457 2 - taken by more users */
458
459
460 #if defined NOT_IN_libc || defined UP
461 # define lll_trylock(futex) lll_mutex_trylock (futex)
462 # define lll_lock(futex) lll_mutex_lock (futex)
463 # define lll_unlock(futex) lll_mutex_unlock (futex)
464 #else
465 /* Special versions of the macros for use in libc itself. They avoid
466 the lock prefix when the thread library is not used.
467
468 XXX In future we might even want to avoid it on UP machines. */
469 # include <tls.h>
470
471 # define lll_trylock(futex) \
472 ({ unsigned char ret; \
473 __asm __volatile ("cmpl $0, %%gs:%P5\n\t" \
474 "je 0f\n\t" \
475 "lock\n" \
476 "0:\tcmpxchgl %2, %1; setne %0" \
477 : "=a" (ret), "=m" (futex) \
478 : "r" (LLL_MUTEX_LOCK_INITIALIZER_LOCKED), "m" (futex),\
479 "0" (LLL_MUTEX_LOCK_INITIALIZER), \
480 "i" (offsetof (tcbhead_t, multiple_threads)) \
481 : "memory"); \
482 ret; })
483
484
485 # define lll_lock(futex) \
486 (void) ({ int ignore1, ignore2; \
487 __asm __volatile ("cmpl $0, %%gs:%P6\n\t" \
488 "je 0f\n\t" \
489 "lock\n" \
490 "0:\tcmpxchgl %1, %2\n\t" \
491 "jnz _L_lock_%=\n\t" \
492 ".subsection 1\n\t" \
493 ".type _L_lock_%=,@function\n" \
494 "_L_lock_%=:\n" \
495 "1:\tleal %2, %%ecx\n" \
496 "2:\tcall __lll_mutex_lock_wait\n" \
497 "3:\tjmp 18f\n" \
498 "4:\t.size _L_lock_%=, 4b-1b\n\t" \
499 ".previous\n" \
500 LLL_STUB_UNWIND_INFO_3 \
501 "18:" \
502 : "=a" (ignore1), "=c" (ignore2), "=m" (futex) \
503 : "0" (0), "1" (1), "m" (futex), \
504 "i" (offsetof (tcbhead_t, multiple_threads)) \
505 : "memory"); })
506
507
508 # define lll_unlock(futex) \
509 (void) ({ int ignore; \
510 __asm __volatile ("cmpl $0, %%gs:%P3\n\t" \
511 "je 0f\n\t" \
512 "lock\n" \
513 "0:\tsubl $1,%0\n\t" \
514 "jne _L_unlock_%=\n\t" \
515 ".subsection 1\n\t" \
516 ".type _L_unlock_%=,@function\n" \
517 "_L_unlock_%=:\n" \
518 "1:\tleal %0, %%eax\n" \
519 "2:\tcall __lll_mutex_unlock_wake\n" \
520 "3:\tjmp 18f\n\t" \
521 "4:\t.size _L_unlock_%=, 4b-1b\n\t" \
522 ".previous\n" \
523 LLL_STUB_UNWIND_INFO_3 \
524 "18:" \
525 : "=m" (futex), "=&a" (ignore) \
526 : "m" (futex), \
527 "i" (offsetof (tcbhead_t, multiple_threads)) \
528 : "memory"); })
529 #endif
530
531
532 #define lll_islocked(futex) \
533 (futex != LLL_LOCK_INITIALIZER)
534
535
536 /* The kernel notifies a process with uses CLONE_CLEARTID via futex
537 wakeup when the clone terminates. The memory location contains the
538 thread ID while the clone is running and is reset to zero
539 afterwards.
540
541 The macro parameter must not have any side effect. */
542 #define lll_wait_tid(tid) \
543 do { \
544 int __ignore; \
545 register __typeof (tid) _tid asm ("edx") = (tid); \
546 if (_tid != 0) \
547 __asm __volatile (LLL_EBX_LOAD \
548 "1:\tmovl %1, %%eax\n\t" \
549 LLL_ENTER_KERNEL \
550 "cmpl $0, (%%ebx)\n\t" \
551 "jne 1b\n\t" \
552 LLL_EBX_LOAD \
553 : "=&a" (__ignore) \
554 : "i" (SYS_futex), LLL_EBX_REG (&tid), "S" (0), \
555 "c" (FUTEX_WAIT), "d" (_tid), \
556 "i" (offsetof (tcbhead_t, sysinfo)) \
557 : "memory"); \
558 } while (0)
559
560 extern int __lll_timedwait_tid (int *tid, const struct timespec *abstime)
561 __attribute__ ((regparm (2))) attribute_hidden;
562 #define lll_timedwait_tid(tid, abstime) \
563 ({ \
564 int __result = 0; \
565 if (tid != 0) \
566 { \
567 if (abstime->tv_nsec < 0 || abstime->tv_nsec >= 1000000000) \
568 __result = EINVAL; \
569 else \
570 __result = __lll_timedwait_tid (&tid, abstime); \
571 } \
572 __result; })
573
574
575 /* Conditional variable handling. */
576
577 extern void __lll_cond_wait (pthread_cond_t *cond)
578 __attribute ((regparm (1))) attribute_hidden;
579 extern int __lll_cond_timedwait (pthread_cond_t *cond,
580 const struct timespec *abstime)
581 __attribute ((regparm (2))) attribute_hidden;
582 extern void __lll_cond_wake (pthread_cond_t *cond)
583 __attribute ((regparm (1))) attribute_hidden;
584 extern void __lll_cond_broadcast (pthread_cond_t *cond)
585 __attribute ((regparm (1))) attribute_hidden;
586
587
588 #define lll_cond_wait(cond) \
589 __lll_cond_wait (cond)
590 #define lll_cond_timedwait(cond, abstime) \
591 __lll_cond_timedwait (cond, abstime)
592 #define lll_cond_wake(cond) \
593 __lll_cond_wake (cond)
594 #define lll_cond_broadcast(cond) \
595 __lll_cond_broadcast (cond)
596
597
598 #endif /* lowlevellock.h */
sources.redhat.com git mirror of glibc CVS