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Side by Side Diff: fusl/src/thread/pthread_once.c

Issue 1714623002: [fusl] clang-format fusl (Closed) Base URL: git@github.com:domokit/mojo.git@master
Patch Set: headers too Created 4 years, 10 months ago
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1 #include "pthread_impl.h" 1 #include "pthread_impl.h"
2 2
3 static void undo(void *control) 3 static void undo(void* control) {
4 { 4 /* Wake all waiters, since the waiter status is lost when
5 » /* Wake all waiters, since the waiter status is lost when 5 * resetting control to the initial state. */
6 » * resetting control to the initial state. */ 6 if (a_swap(control, 0) == 3)
7 » if (a_swap(control, 0) == 3) 7 __wake(control, -1, 1);
8 » » __wake(control, -1, 1);
9 } 8 }
10 9
11 int __pthread_once_full(pthread_once_t *control, void (*init)(void)) 10 int __pthread_once_full(pthread_once_t* control, void (*init)(void)) {
12 { 11 /* Try to enter initializing state. Four possibilities:
13 » /* Try to enter initializing state. Four possibilities: 12 * 0 - we're the first or the other cancelled; run init
14 » * 0 - we're the first or the other cancelled; run init 13 * 1 - another thread is running init; wait
15 » * 1 - another thread is running init; wait 14 * 2 - another thread finished running init; just return
16 » * 2 - another thread finished running init; just return 15 * 3 - another thread is running init, waiters present; wait */
17 » * 3 - another thread is running init, waiters present; wait */
18 16
19 » for (;;) switch (a_cas(control, 0, 1)) { 17 for (;;)
20 » case 0: 18 switch (a_cas(control, 0, 1)) {
21 » » pthread_cleanup_push(undo, control); 19 case 0:
22 » » init(); 20 pthread_cleanup_push(undo, control);
23 » » pthread_cleanup_pop(0); 21 init();
22 pthread_cleanup_pop(0);
24 23
25 » » if (a_swap(control, 2) == 3) 24 if (a_swap(control, 2) == 3)
26 » » » __wake(control, -1, 1); 25 __wake(control, -1, 1);
27 » » return 0; 26 return 0;
28 » case 1: 27 case 1:
29 » » /* If this fails, so will __wait. */ 28 /* If this fails, so will __wait. */
30 » » a_cas(control, 1, 3); 29 a_cas(control, 1, 3);
31 » case 3: 30 case 3:
32 » » __wait(control, 0, 3, 1); 31 __wait(control, 0, 3, 1);
33 » » continue; 32 continue;
34 » case 2: 33 case 2:
35 » » return 0; 34 return 0;
36 » } 35 }
37 } 36 }
38 37
39 int __pthread_once(pthread_once_t *control, void (*init)(void)) 38 int __pthread_once(pthread_once_t* control, void (*init)(void)) {
40 { 39 /* Return immediately if init finished before, but ensure that
41 » /* Return immediately if init finished before, but ensure that 40 * effects of the init routine are visible to the caller. */
42 » * effects of the init routine are visible to the caller. */ 41 if (*(volatile int*)control == 2) {
43 » if (*(volatile int *)control == 2) { 42 a_barrier();
44 » » a_barrier(); 43 return 0;
45 » » return 0; 44 }
46 » } 45 return __pthread_once_full(control, init);
47 » return __pthread_once_full(control, init);
48 } 46 }
49 47
50 weak_alias(__pthread_once, pthread_once); 48 weak_alias(__pthread_once, pthread_once);
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