Line data Source code
1 : /*
2 : Minetest
3 : Copyright (C) 2013 sapier, < sapier AT gmx DOT net >
4 :
5 : This program is free software; you can redistribute it and/or modify
6 : it under the terms of the GNU Lesser General Public License as published by
7 : the Free Software Foundation; either version 2.1 of the License, or
8 : (at your option) any later version.
9 :
10 : This program 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
13 : GNU Lesser General Public License for more details.
14 :
15 : You should have received a copy of the GNU Lesser General Public License along
16 : with this program; if not, write to the Free Software Foundation, Inc.,
17 : 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
18 : */
19 : #include <assert.h>
20 : #include <errno.h>
21 : #include <sys/time.h>
22 : #include "jthread/jsemaphore.h"
23 : #if defined(__MACH__) && defined(__APPLE__)
24 : #include <unistd.h>
25 : #endif
26 :
27 : #define UNUSED(expr) do { (void)(expr); } while (0)
28 :
29 : #if defined(__MACH__) && defined(__APPLE__)
30 : #undef sem_t
31 : #undef sem_init
32 : #undef sem_wait
33 : #undef sem_post
34 : #undef sem_destroy
35 : #define sem_t semaphore_t
36 : #define sem_init(s, p, c) semaphore_create(mach_task_self(), (s), 0, (c))
37 : #define sem_wait(s) semaphore_wait(*(s))
38 : #define sem_post(s) semaphore_signal(*(s))
39 : #define sem_destroy(s) semaphore_destroy(mach_task_self(), *(s))
40 : pthread_mutex_t semcount_mutex;
41 : #endif
42 :
43 12 : JSemaphore::JSemaphore() {
44 12 : int sem_init_retval = sem_init(&m_semaphore,0,0);
45 : assert(sem_init_retval == 0);
46 : UNUSED(sem_init_retval);
47 : #if defined(__MACH__) && defined(__APPLE__)
48 : semcount = 0;
49 : #endif
50 12 : }
51 :
52 22 : JSemaphore::~JSemaphore() {
53 11 : int sem_destroy_retval = sem_destroy(&m_semaphore);
54 : #ifdef __ANDROID__
55 : // WORKAROUND for broken bionic semaphore implementation!
56 : assert(
57 : (sem_destroy_retval == 0) ||
58 : (errno == EBUSY)
59 : );
60 : #else
61 : assert(sem_destroy_retval == 0);
62 : #endif
63 : UNUSED(sem_destroy_retval);
64 11 : }
65 :
66 0 : JSemaphore::JSemaphore(int initval) {
67 0 : int sem_init_retval = sem_init(&m_semaphore,0,initval);
68 : assert(sem_init_retval == 0);
69 : UNUSED(sem_init_retval);
70 0 : }
71 :
72 22801 : void JSemaphore::Post() {
73 22801 : int sem_post_retval = sem_post(&m_semaphore);
74 : assert(sem_post_retval == 0);
75 : UNUSED(sem_post_retval);
76 : #if defined(__MACH__) && defined(__APPLE__)
77 : pthread_mutex_lock(&semcount_mutex);
78 : semcount++;
79 : pthread_mutex_unlock(&semcount_mutex);
80 : #endif
81 22801 : }
82 :
83 7688 : void JSemaphore::Wait() {
84 7688 : int sem_wait_retval = sem_wait(&m_semaphore);
85 : assert(sem_wait_retval == 0);
86 : UNUSED(sem_wait_retval);
87 : #if defined(__MACH__) && defined(__APPLE__)
88 : pthread_mutex_lock(&semcount_mutex);
89 : semcount--;
90 : pthread_mutex_unlock(&semcount_mutex);
91 : #endif
92 7686 : }
93 :
94 23174 : bool JSemaphore::Wait(unsigned int time_ms) {
95 : #if defined(__MACH__) && defined(__APPLE__)
96 : mach_timespec_t waittime;
97 : waittime.tv_sec = time_ms / 1000;
98 : waittime.tv_nsec = 1000000 * (time_ms % 1000);
99 : #else
100 : struct timespec waittime;
101 : #endif
102 : struct timeval now;
103 :
104 23174 : if (gettimeofday(&now, NULL) == -1) {
105 : assert("Unable to get time by clock_gettime!" == 0);
106 0 : return false;
107 : }
108 :
109 : #if !(defined(__MACH__) && defined(__APPLE__))
110 23174 : waittime.tv_nsec = ((time_ms % 1000) * 1000 * 1000) + (now.tv_usec * 1000);
111 23174 : waittime.tv_sec = (time_ms / 1000) + (waittime.tv_nsec / (1000*1000*1000)) + now.tv_sec;
112 23174 : waittime.tv_nsec %= 1000*1000*1000;
113 : #endif
114 :
115 23174 : errno = 0;
116 : #if defined(__MACH__) && defined(__APPLE__)
117 : int sem_wait_retval = semaphore_timedwait(m_semaphore, waittime);
118 : if (sem_wait_retval == KERN_OPERATION_TIMED_OUT) {
119 : errno = ETIMEDOUT;
120 : } else if (sem_wait_retval == KERN_ABORTED) {
121 : errno = EINTR;
122 : } else if (sem_wait_retval != 0) {
123 : errno = EINVAL;
124 : }
125 : #else
126 23174 : int sem_wait_retval = sem_timedwait(&m_semaphore, &waittime);
127 : #endif
128 :
129 23174 : if (sem_wait_retval == 0)
130 : {
131 : #if defined(__MACH__) && defined(__APPLE__)
132 : pthread_mutex_lock(&semcount_mutex);
133 : semcount--;
134 : pthread_mutex_unlock(&semcount_mutex);
135 : #endif
136 14821 : return true;
137 : }
138 : else {
139 : assert((errno == ETIMEDOUT) || (errno == EINTR));
140 8353 : return false;
141 : }
142 : return sem_wait_retval == 0 ? true : false;
143 : }
144 :
145 5542 : int JSemaphore::GetValue() {
146 5542 : int retval = 0;
147 : #if defined(__MACH__) && defined(__APPLE__)
148 : pthread_mutex_lock(&semcount_mutex);
149 : retval = semcount;
150 : pthread_mutex_unlock(&semcount_mutex);
151 : #else
152 5542 : sem_getvalue(&m_semaphore, &retval);
153 : #endif
154 5542 : return retval;
155 : }
156 :
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