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
|
#include "stdafx.h"
#include "Condition.h"
namespace os {
#ifdef WINDOWS
Condition::Condition() : signaled(0) {
sema = CreateSemaphore(NULL, 0, 1, NULL);
}
Condition::~Condition() {
CloseHandle(sema);
}
void Condition::signal() {
// If we're the first one to signal, alter the semaphore.
if (atomicCAS(signaled, 0, 1) == 0)
ReleaseSemaphore(sema, 1, NULL);
}
void Condition::wait() {
// Wait for someone to signal, and then reset the signaled state for next time.
WaitForSingleObject(sema, INFINITE);
atomicCAS(signaled, 1, 0);
}
bool Condition::wait(nat msTimeout) {
DWORD result = WaitForSingleObject(sema, msTimeout);
if (result == WAIT_OBJECT_0) {
atomicCAS(signaled, 1, 0);
return true;
} else {
return false;
}
}
#endif
#ifdef POSIX
Condition::Condition() : signaled(0) {
pthread_condattr_t attr;
pthread_condattr_init(&attr);
pthread_condattr_setclock(&attr, CLOCK_MONOTONIC);
pthread_cond_init(&cond, &attr);
pthread_condattr_destroy(&attr);
pthread_mutex_init(&mutex, null);
}
Condition::~Condition() {
pthread_cond_destroy(&cond);
}
void Condition::signal() {
if (atomicCAS(signaled, 0, 1) == 0)
pthread_cond_signal(&cond);
}
void Condition::wait() {
pthread_mutex_lock(&mutex);
if (atomicCAS(signaled, 1, 0) == 0)
pthread_cond_wait(&cond, &mutex);
pthread_mutex_unlock(&mutex);
}
static long ns(long ms) {
return ms * 1000000;
}
static struct timespec timeMs(nat ms) {
struct timespec time = {0, 0};
clock_gettime(CLOCK_MONOTONIC, &time);
nat s = ms / 1000;
ms = ms % 1000;
time.tv_sec += s;
time.tv_nsec += ns(ms);
while (time.tv_nsec >= ns(1000)) {
time.tv_nsec -= ns(1000);
time.tv_sec += 1;
}
return time;
}
bool Condition::wait(nat msTimeout) {
struct timespec time = timeMs(msTimeout);;
int r = 0;
pthread_mutex_lock(&mutex);
if (atomicCAS(signaled, 1, 0) == 0)
r = pthread_cond_timedwait(&cond, &mutex, &time);
pthread_mutex_unlock(&mutex);
if (r == 0)
return true;
else
return errno != ETIMEDOUT;
}
#endif
}
|
