This repository has been archived by the owner on Feb 11, 2021. It is now read-only.
SDL_systhread.c
1
2
/*
Simple DirectMedia Layer
3
Copyright (C) 1997-2013 Sam Lantinga <slouken@libsdl.org>
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
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_config.h"
#include <pthread.h>
#if HAVE_PTHREAD_NP_H
#include <pthread_np.h>
#endif
#include <signal.h>
#ifdef __LINUX__
#include <sys/time.h>
#include <sys/resource.h>
#include <sys/syscall.h>
#include <unistd.h>
#endif // __LINUX__
#if defined(__LINUX__) || defined(__MACOSX__) || defined(__IPHONEOS__)
#include <dlfcn.h>
#ifndef RTLD_DEFAULT
#define RTLD_DEFAULT NULL
#endif
#endif
#include "SDL_platform.h"
#include "SDL_thread.h"
#include "../SDL_thread_c.h"
#include "../SDL_systhread.h"
#ifdef __ANDROID__
#include "../../core/android/SDL_android.h"
#endif
#include "SDL_assert.h"
/* List of signals to mask in the subthreads */
static const int sig_list[] = {
SIGHUP, SIGINT, SIGQUIT, SIGPIPE, SIGALRM, SIGTERM, SIGCHLD, SIGWINCH,
SIGVTALRM, SIGPROF, 0
};
static void *
RunThread(void *data)
{
#ifdef __ANDROID__
Android_JNI_SetupThread();
#endif
SDL_RunThread(data);
return NULL;
}
#if defined(__MACOSX__) || defined(__IPHONEOS__)
static SDL_bool checked_setname = SDL_FALSE;
static int (*ppthread_setname_np)(const char*) = NULL;
#elif defined(__LINUX__)
static SDL_bool checked_setname = SDL_FALSE;
static int (*ppthread_setname_np)(pthread_t, const char*) = NULL;
#endif
int
SDL_SYS_CreateThread(SDL_Thread * thread, void *args)
{
pthread_attr_t type;
/* do this here before any threads exist, so there's no race condition. */
#if defined(__MACOSX__) || defined(__IPHONEOS__) || defined(__LINUX__)
if (!checked_setname) {
void *fn = dlsym(RTLD_DEFAULT, "pthread_setname_np");
#if defined(__MACOSX__) || defined(__IPHONEOS__)
ppthread_setname_np = (int(*)(const char*)) fn;
#elif defined(__LINUX__)
ppthread_setname_np = (int(*)(pthread_t, const char*)) fn;
#endif
checked_setname = SDL_TRUE;
}
#endif
/* Set the thread attributes */
if (pthread_attr_init(&type) != 0) {
100
return SDL_SetError("Couldn't initialize pthread attributes");
101
102
103
104
105
}
pthread_attr_setdetachstate(&type, PTHREAD_CREATE_JOINABLE);
/* Create the thread and go! */
if (pthread_create(&thread->handle, &type, RunThread, args) != 0) {
106
return SDL_SetError("Not enough resources to create thread");
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
}
void
SDL_SYS_SetupThread(const char *name)
{
int i;
sigset_t mask;
if (name != NULL) {
#if defined(__MACOSX__) || defined(__IPHONEOS__) || defined(__LINUX__)
SDL_assert(checked_setname);
if (ppthread_setname_np != NULL) {
#if defined(__MACOSX__) || defined(__IPHONEOS__)
ppthread_setname_np(name);
#elif defined(__LINUX__)
ppthread_setname_np(pthread_self(), name);
#endif
}
#elif HAVE_PTHREAD_SETNAME_NP
pthread_setname_np(pthread_self(), name);
#elif HAVE_PTHREAD_SET_NAME_NP
pthread_set_name_np(pthread_self(), name);
#endif
}
/* Mask asynchronous signals for this thread */
sigemptyset(&mask);
for (i = 0; sig_list[i]; ++i) {
sigaddset(&mask, sig_list[i]);
}
pthread_sigmask(SIG_BLOCK, &mask, 0);
#ifdef PTHREAD_CANCEL_ASYNCHRONOUS
/* Allow ourselves to be asynchronously cancelled */
{
int oldstate;
pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, &oldstate);
}
#endif
}
SDL_threadID
SDL_ThreadID(void)
{
return ((SDL_threadID) pthread_self());
}
int
SDL_SYS_SetThreadPriority(SDL_ThreadPriority priority)
{
#ifdef __LINUX__
int value;
if (priority == SDL_THREAD_PRIORITY_LOW) {
value = 19;
} else if (priority == SDL_THREAD_PRIORITY_HIGH) {
value = -20;
} else {
value = 0;
}
if (setpriority(PRIO_PROCESS, syscall(SYS_gettid), value) < 0) {
/* Note that this fails if you're trying to set high priority
and you don't have root permission. BUT DON'T RUN AS ROOT!
*/
174
return SDL_SetError("setpriority() failed");
175
176
177
178
179
180
181
182
}
return 0;
#else
struct sched_param sched;
int policy;
pthread_t thread = pthread_self();
if (pthread_getschedparam(thread, &policy, &sched) < 0) {
183
return SDL_SetError("pthread_getschedparam() failed");
184
185
186
187
188
189
190
191
192
193
194
}
if (priority == SDL_THREAD_PRIORITY_LOW) {
sched.sched_priority = sched_get_priority_min(policy);
} else if (priority == SDL_THREAD_PRIORITY_HIGH) {
sched.sched_priority = sched_get_priority_max(policy);
} else {
int min_priority = sched_get_priority_min(policy);
int max_priority = sched_get_priority_max(policy);
sched.sched_priority = (min_priority + (max_priority - min_priority) / 2);
}
if (pthread_setschedparam(thread, policy, &sched) < 0) {
195
return SDL_SetError("pthread_setschedparam() failed");
196
197
198
199
200
201
202
203
204
205
206
207
}
return 0;
#endif /* linux */
}
void
SDL_SYS_WaitThread(SDL_Thread * thread)
{
pthread_join(thread->handle, 0);
}
/* vi: set ts=4 sw=4 expandtab: */