1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
|
/*
Simple DirectMedia Layer
Copyright (C) 1997-2025 Sam Lantinga <slouken@libsdl.org>
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
*/
#include "SDL_internal.h"
#include <sys/time.h>
#include <time.h>
#include <unistd.h>
#include <errno.h>
#include <pthread.h>
#include "SDL_sysmutex_c.h"
struct SDL_Condition
{
pthread_cond_t cond;
};
// Create a condition variable
SDL_Condition *SDL_CreateCondition(void)
{
SDL_Condition *cond;
cond = (SDL_Condition *)SDL_malloc(sizeof(SDL_Condition));
if (cond) {
if (pthread_cond_init(&cond->cond, NULL) != 0) {
SDL_SetError("pthread_cond_init() failed");
SDL_free(cond);
cond = NULL;
}
}
return cond;
}
// Destroy a condition variable
void SDL_DestroyCondition(SDL_Condition *cond)
{
if (cond) {
pthread_cond_destroy(&cond->cond);
SDL_free(cond);
}
}
// Restart one of the threads that are waiting on the condition variable
void SDL_SignalCondition(SDL_Condition *cond)
{
if (!cond) {
return;
}
pthread_cond_signal(&cond->cond);
}
// Restart all threads that are waiting on the condition variable
void SDL_BroadcastCondition(SDL_Condition *cond)
{
if (!cond) {
return;
}
pthread_cond_broadcast(&cond->cond);
}
bool SDL_WaitConditionTimeoutNS(SDL_Condition *cond, SDL_Mutex *mutex, Sint64 timeoutNS)
{
#ifndef HAVE_CLOCK_GETTIME
struct timeval delta;
#endif
struct timespec abstime;
if (!cond || !mutex) {
return true;
}
if (timeoutNS < 0) {
return (pthread_cond_wait(&cond->cond, &mutex->id) == 0);
}
#ifdef HAVE_CLOCK_GETTIME
clock_gettime(CLOCK_REALTIME, &abstime);
abstime.tv_sec += (timeoutNS / SDL_NS_PER_SECOND);
abstime.tv_nsec += (timeoutNS % SDL_NS_PER_SECOND);
#else
gettimeofday(&delta, NULL);
abstime.tv_sec = delta.tv_sec + (timeoutNS / SDL_NS_PER_SECOND);
abstime.tv_nsec = SDL_US_TO_NS(delta.tv_usec) + (timeoutNS % SDL_NS_PER_SECOND);
#endif
while (abstime.tv_nsec >= 1000000000) {
abstime.tv_sec += 1;
abstime.tv_nsec -= 1000000000;
}
bool result;
int rc;
tryagain:
rc = pthread_cond_timedwait(&cond->cond, &mutex->id, &abstime);
switch (rc) {
case EINTR:
goto tryagain;
// break; -Wunreachable-code-break
case ETIMEDOUT:
result = false;
break;
default:
result = true;
break;
}
return result;
}
|
