SDL  2.0
SDL_systhread.c File Reference
#include "../../SDL_internal.h"
#include "SDL_system.h"
#include <pthread.h>
#include <signal.h>
#include "SDL_log.h"
#include "SDL_platform.h"
#include "SDL_thread.h"
#include "../SDL_thread_c.h"
#include "../SDL_systhread.h"
#include "SDL_assert.h"
+ Include dependency graph for SDL_systhread.c:

Go to the source code of this file.

Functions

static voidRunThread (void *data)
 
int SDL_SYS_CreateThread (SDL_Thread *thread, void *args)
 
void SDL_SYS_SetupThread (const char *name)
 
SDL_threadID SDL_ThreadID (void)
 
int SDL_SYS_SetThreadPriority (SDL_ThreadPriority priority)
 
void SDL_SYS_WaitThread (SDL_Thread *thread)
 
void SDL_SYS_DetachThread (SDL_Thread *thread)
 

Variables

static const int sig_list []
 

Function Documentation

◆ RunThread()

static void* RunThread ( void data)
static

Definition at line 74 of file SDL_systhread.c.

75 {
76 #ifdef __ANDROID__
78 #endif
80  return NULL;
81 }

References Android_JNI_SetupThread(), NULL, and SDL_RunThread().

Referenced by SDL_SYS_CreateThread().

◆ SDL_SYS_CreateThread()

int SDL_SYS_CreateThread ( SDL_Thread thread,
void args 
)

Definition at line 91 of file SDL_systhread.c.

92 {
93  pthread_attr_t type;
94 
95  /* do this here before any threads exist, so there's no race condition. */
96  #if defined(__MACOSX__) || defined(__IPHONEOS__) || defined(__LINUX__)
97  if (!checked_setname) {
98  void *fn = dlsym(RTLD_DEFAULT, "pthread_setname_np");
99  #if defined(__MACOSX__) || defined(__IPHONEOS__)
100  ppthread_setname_np = (int(*)(const char*)) fn;
101  #elif defined(__LINUX__)
102  ppthread_setname_np = (int(*)(pthread_t, const char*)) fn;
103  #endif
104  checked_setname = SDL_TRUE;
105  }
106  #endif
107 
108  /* Set the thread attributes */
109  if (pthread_attr_init(&type) != 0) {
110  return SDL_SetError("Couldn't initialize pthread attributes");
111  }
112  pthread_attr_setdetachstate(&type, PTHREAD_CREATE_JOINABLE);
113 
114  /* Set caller-requested stack size. Otherwise: use the system default. */
115  if (thread->stacksize) {
116  pthread_attr_setstacksize(&type, thread->stacksize);
117  }
118 
119  /* Create the thread and go! */
120  if (pthread_create(&thread->handle, &type, RunThread, args) != 0) {
121  return SDL_SetError("Not enough resources to create thread");
122  }
123 
124  return 0;
125 }

References SDL_Thread::handle, RunThread(), SDL_SetError, SDL_TRUE, and SDL_Thread::stacksize.

◆ SDL_SYS_DetachThread()

void SDL_SYS_DetachThread ( SDL_Thread thread)

Definition at line 242 of file SDL_systhread.c.

243 {
244  pthread_detach(thread->handle);
245 }

References SDL_Thread::handle.

◆ SDL_SYS_SetThreadPriority()

int SDL_SYS_SetThreadPriority ( SDL_ThreadPriority  priority)

Definition at line 189 of file SDL_systhread.c.

190 {
191 #if __NACL__ || __RISCOS__
192  /* FIXME: Setting thread priority does not seem to be supported in NACL */
193  return 0;
194 #elif __LINUX__
195  int value;
196  pid_t thread = syscall(SYS_gettid);
197 
198  if (priority == SDL_THREAD_PRIORITY_LOW) {
199  value = 19;
200  } else if (priority == SDL_THREAD_PRIORITY_HIGH) {
201  value = -10;
202  } else if (priority == SDL_THREAD_PRIORITY_TIME_CRITICAL) {
203  value = -20;
204  } else {
205  value = 0;
206  }
207  return SDL_LinuxSetThreadPriority(thread, value);
208 #else
209  struct sched_param sched;
210  int policy;
211  pthread_t thread = pthread_self();
212 
213  if (pthread_getschedparam(thread, &policy, &sched) != 0) {
214  return SDL_SetError("pthread_getschedparam() failed");
215  }
216  if (priority == SDL_THREAD_PRIORITY_LOW) {
217  sched.sched_priority = sched_get_priority_min(policy);
218  } else if (priority == SDL_THREAD_PRIORITY_TIME_CRITICAL) {
219  sched.sched_priority = sched_get_priority_max(policy);
220  } else {
221  int min_priority = sched_get_priority_min(policy);
222  int max_priority = sched_get_priority_max(policy);
223  sched.sched_priority = (min_priority + (max_priority - min_priority) / 2);
224  if (priority == SDL_THREAD_PRIORITY_HIGH) {
225  sched.sched_priority += ((max_priority - min_priority) / 4);
226  }
227  }
228  if (pthread_setschedparam(thread, policy, &sched) != 0) {
229  return SDL_SetError("pthread_setschedparam() failed");
230  }
231  return 0;
232 #endif /* linux */
233 }

References SDL_LinuxSetThreadPriority, SDL_SetError, SDL_THREAD_PRIORITY_HIGH, SDL_THREAD_PRIORITY_LOW, and SDL_THREAD_PRIORITY_TIME_CRITICAL.

◆ SDL_SYS_SetupThread()

void SDL_SYS_SetupThread ( const char *  name)

Definition at line 128 of file SDL_systhread.c.

129 {
130 #if !defined(__NACL__)
131  int i;
132  sigset_t mask;
133 #endif /* !__NACL__ */
134 
135  if (name != NULL) {
136  #if defined(__MACOSX__) || defined(__IPHONEOS__) || defined(__LINUX__)
137  SDL_assert(checked_setname);
138  if (ppthread_setname_np != NULL) {
139  #if defined(__MACOSX__) || defined(__IPHONEOS__)
140  ppthread_setname_np(name);
141  #elif defined(__LINUX__)
142  ppthread_setname_np(pthread_self(), name);
143  #endif
144  }
145  #elif HAVE_PTHREAD_SETNAME_NP
146  #if defined(__NETBSD__)
147  pthread_setname_np(pthread_self(), "%s", name);
148  #else
149  pthread_setname_np(pthread_self(), name);
150  #endif
151  #elif HAVE_PTHREAD_SET_NAME_NP
152  pthread_set_name_np(pthread_self(), name);
153  #elif defined(__HAIKU__)
154  /* The docs say the thread name can't be longer than B_OS_NAME_LENGTH. */
155  char namebuf[B_OS_NAME_LENGTH];
156  SDL_snprintf(namebuf, sizeof (namebuf), "%s", name);
157  namebuf[sizeof (namebuf) - 1] = '\0';
158  rename_thread(find_thread(NULL), namebuf);
159  #endif
160  }
161 
162  /* NativeClient does not yet support signals.*/
163 #if !defined(__NACL__)
164  /* Mask asynchronous signals for this thread */
165  sigemptyset(&mask);
166  for (i = 0; sig_list[i]; ++i) {
167  sigaddset(&mask, sig_list[i]);
168  }
169  pthread_sigmask(SIG_BLOCK, &mask, 0);
170 #endif /* !__NACL__ */
171 
172 
173 #ifdef PTHREAD_CANCEL_ASYNCHRONOUS
174  /* Allow ourselves to be asynchronously cancelled */
175  {
176  int oldstate;
177  pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, &oldstate);
178  }
179 #endif
180 }

References i, NULL, SDL_assert, SDL_snprintf, and sig_list.

◆ SDL_SYS_WaitThread()

void SDL_SYS_WaitThread ( SDL_Thread thread)

Definition at line 236 of file SDL_systhread.c.

237 {
238  pthread_join(thread->handle, 0);
239 }

References SDL_Thread::handle.

◆ SDL_ThreadID()

SDL_threadID SDL_ThreadID ( void  )

Get the thread identifier for the current thread.

Definition at line 183 of file SDL_systhread.c.

184 {
185  return ((SDL_threadID) pthread_self());
186 }

Variable Documentation

◆ sig_list

const int sig_list[]
static
Initial value:
= {
SIGHUP, SIGINT, SIGQUIT, SIGPIPE, SIGALRM, SIGTERM, SIGCHLD, SIGWINCH,
SIGVTALRM, SIGPROF, 0
}

Definition at line 67 of file SDL_systhread.c.

Referenced by SDL_SYS_SetupThread().

mask
GLenum GLint GLuint mask
Definition: SDL_opengl_glext.h:660
Android_JNI_SetupThread
int Android_JNI_SetupThread(void)
SDL_Thread::stacksize
size_t stacksize
Definition: SDL_thread_c.h:62
NULL
#define NULL
Definition: begin_code.h:167
policy
EGLint policy
Definition: eglext.h:593
SDL_RunThread
void SDL_RunThread(void *data)
Definition: SDL_thread.c:271
SDL_THREAD_PRIORITY_TIME_CRITICAL
@ SDL_THREAD_PRIORITY_TIME_CRITICAL
Definition: SDL_thread.h:63
SDL_THREAD_PRIORITY_HIGH
@ SDL_THREAD_PRIORITY_HIGH
Definition: SDL_thread.h:62
SDL_THREAD_PRIORITY_LOW
@ SDL_THREAD_PRIORITY_LOW
Definition: SDL_thread.h:60
data
GLint GLenum GLsizei GLsizei GLsizei GLint GLsizei const GLvoid * data
Definition: SDL_opengl.h:1974
RunThread
static void * RunThread(void *data)
Definition: SDL_systhread.c:74
SDL_LinuxSetThreadPriority
#define SDL_LinuxSetThreadPriority
Definition: SDL_dynapi_overrides.h:673
sig_list
static const int sig_list[]
Definition: SDL_systhread.c:67
name
GLuint const GLchar * name
Definition: SDL_opengl_glext.h:663
SDL_TRUE
@ SDL_TRUE
Definition: SDL_stdinc.h:164
SDL_assert
#define SDL_assert(condition)
Definition: SDL_assert.h:169
SDL_threadID
unsigned long SDL_threadID
Definition: SDL_thread.h:49
value
GLsizei const GLfloat * value
Definition: SDL_opengl_glext.h:701
SDL_SetError
#define SDL_SetError
Definition: SDL_dynapi_overrides.h:30
SDL_snprintf
#define SDL_snprintf
Definition: SDL_dynapi_overrides.h:40
SDL_Thread::handle
SYS_ThreadHandle handle
Definition: SDL_thread_c.h:57
type
GLuint GLuint GLsizei GLenum type
Definition: SDL_opengl.h:1571
i
return Display return Display Bool Bool int int int return Display XEvent Bool(*) XPointer return Display return Display Drawable _Xconst char unsigned int unsigned int return Display Pixmap Pixmap XColor XColor unsigned int unsigned int return Display _Xconst char char int char return Display Visual unsigned int int int char unsigned int unsigned int in i)
Definition: SDL_x11sym.h:50