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
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
|
/*
* This file is subject to the terms of the GFX License. If a copy of
* the license was not distributed with this file, you can obtain one at:
*
* http://ugfx.org/license.html
*/
#include "gfx.h"
#if GFX_USE_OS_OSX
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <time.h>
#include <sys/time.h>
#include <sched.h>
#include <mach/clock.h>
#include <mach/mach.h>
static gfxMutex SystemMutex;
void _gosInit(void)
{
/* No initialization of the operating system itself is needed */
gfxMutexInit(&SystemMutex);
}
void _gosDeinit(void)
{
/* ToDo */
}
void gfxSystemLock(void) {
gfxMutexEnter(&SystemMutex);
}
void gfxSystemUnlock(void) {
gfxMutexExit(&SystemMutex);
}
void gfxHalt(const char *msg) {
if (msg)
fprintf(stderr, "%s\n", msg);
exit(1);
}
void gfxSleepMilliseconds(delaytime_t ms) {
struct timespec ts;
switch(ms) {
case TIME_IMMEDIATE: gfxYield(); return;
case TIME_INFINITE: while(1) sleep(60); return;
default:
ts.tv_sec = ms / 1000;
ts.tv_nsec = (ms % 1000) * 1000000;
nanosleep(&ts, 0);
return;
}
}
void gfxSleepMicroseconds(delaytime_t us) {
struct timespec ts;
switch(us) {
case TIME_IMMEDIATE: gfxYield(); return;
case TIME_INFINITE: while(1) sleep(60); return;
default:
ts.tv_sec = us / 1000000;
ts.tv_nsec = (us % 1000000) * 1000;
nanosleep(&ts, 0);
return;
}
}
systemticks_t gfxSystemTicks(void) {
mach_timespec_t ts;
clock_serv_t cclock;
host_get_clock_service(mach_host_self(), SYSTEM_CLOCK, &cclock);
clock_get_time(cclock, &ts);
mach_port_deallocate(mach_task_self(), cclock);
return ts.tv_sec * 1000UL + ts.tv_nsec / 1000000;
}
gfxThreadHandle gfxThreadCreate(void *stackarea, size_t stacksz, threadpriority_t prio, DECLARE_THREAD_FUNCTION((*fn),p), void *param) {
gfxThreadHandle th;
(void) stackarea;
(void) stacksz;
(void) prio;
// Implementing priority with pthreads is a rats nest that is also pthreads implementation dependent.
// Only some pthreads schedulers support it, some implementations use the operating system process priority mechanisms.
// Even those that do support it can have different ranges of priority and "normal" priority is an undefined concept.
// Across different UNIX style operating systems things can be very different (let alone OS's such as Windows).
// Even just Linux changes the way priority works with different kernel schedulers and across kernel versions.
// For these reasons we ignore the priority.
if (pthread_create(&th, 0, fn, param))
return 0;
return th;
}
threadreturn_t gfxThreadWait(gfxThreadHandle thread) {
threadreturn_t retval;
if (pthread_join(thread, &retval))
return 0;
return retval;
}
void gfxSemInit(gfxSem *pSem, semcount_t val, semcount_t limit) {
pthread_mutex_init(&pSem->mtx, 0);
pthread_cond_init(&pSem->cond, 0);
pthread_mutex_lock(&pSem->mtx);
pSem->cnt = val;
pSem->max = limit;
pthread_mutex_unlock(&pSem->mtx);
}
void gfxSemDestroy(gfxSem *pSem) {
pthread_mutex_destroy(&pSem->mtx);
pthread_cond_destroy(&pSem->cond);
}
bool_t gfxSemWait(gfxSem *pSem, delaytime_t ms) {
pthread_mutex_lock(&pSem->mtx);
switch (ms) {
case TIME_INFINITE:
while (!pSem->cnt)
pthread_cond_wait(&pSem->cond, &pSem->mtx);
break;
case TIME_IMMEDIATE:
if (!pSem->cnt) {
pthread_mutex_unlock(&pSem->mtx);
return FALSE;
}
break;
default:
{
struct timeval now;
struct timespec tm;
gettimeofday(&now, 0);
tm.tv_sec = now.tv_sec + ms / 1000;
tm.tv_nsec = now.tv_usec * 1000 + (ms % 1000) * 1000000;
while (!pSem->cnt) {
// We used to test the return value for ETIMEDOUT. This doesn't
// work in some current pthread libraries which return -1 instead
// and set errno to ETIMEDOUT. So, we will return FALSE on any error
// including a ETIMEDOUT.
if (pthread_cond_timedwait(&pSem->cond, &pSem->mtx, &tm)) {
pthread_mutex_unlock(&pSem->mtx);
return FALSE;
}
}
}
break;
}
pSem->cnt--;
pthread_mutex_unlock(&pSem->mtx);
return TRUE;
}
void gfxSemSignal(gfxSem *pSem) {
pthread_mutex_lock(&pSem->mtx);
if (pSem->cnt < pSem->max) {
pSem->cnt++;
pthread_cond_signal(&pSem->cond);
}
pthread_mutex_unlock(&pSem->mtx);
}
semcount_t gfxSemCounter(gfxSem *pSem) {
semcount_t res;
// The locking is really only required if obtaining the count is a divisible operation
// which it might be on a 8/16 bit processor with a 32 bit semaphore count.
pthread_mutex_lock(&pSem->mtx);
res = pSem->cnt;
pthread_mutex_unlock(&pSem->mtx);
return res;
}
#endif /* GFX_USE_OS_OSX */
|
