Commit f521b22eb509b3f436b9af9441185430a7627d1e
2018-04-23T22:07:56
Added SDL_THREAD_PRIORITY_TIME_CRITICAL
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diff --git a/include/SDL_thread.h b/include/SDL_thread.h
index 82a43fc..5d01d5a 100644
--- a/include/SDL_thread.h
+++ b/include/SDL_thread.h
@@ -54,12 +54,13 @@ typedef unsigned int SDL_TLSID;
/**
* The SDL thread priority.
*
- * \note On many systems you require special privileges to set high priority.
+ * \note On many systems you require special privileges to set high or time critical priority.
*/
typedef enum {
SDL_THREAD_PRIORITY_LOW,
SDL_THREAD_PRIORITY_NORMAL,
- SDL_THREAD_PRIORITY_HIGH
+ SDL_THREAD_PRIORITY_HIGH,
+ SDL_THREAD_PRIORITY_TIME_CRITICAL
} SDL_ThreadPriority;
/**
diff --git a/src/audio/SDL_audio.c b/src/audio/SDL_audio.c
index 50ce43c..364e25e 100644
--- a/src/audio/SDL_audio.c
+++ b/src/audio/SDL_audio.c
@@ -651,7 +651,7 @@ SDL_RunAudio(void *devicep)
SDL_assert(!device->iscapture);
/* The audio mixing is always a high priority thread */
- SDL_SetThreadPriority(SDL_THREAD_PRIORITY_HIGH);
+ SDL_SetThreadPriority(SDL_THREAD_PRIORITY_TIME_CRITICAL);
/* Perform any thread setup */
device->threadid = SDL_ThreadID();
diff --git a/src/thread/psp/SDL_systhread.c b/src/thread/psp/SDL_systhread.c
index 9286be5..284f182 100644
--- a/src/thread/psp/SDL_systhread.c
+++ b/src/thread/psp/SDL_systhread.c
@@ -97,6 +97,8 @@ int SDL_SYS_SetThreadPriority(SDL_ThreadPriority priority)
if (priority == SDL_THREAD_PRIORITY_LOW) {
value = 19;
} else if (priority == SDL_THREAD_PRIORITY_HIGH) {
+ value = -10;
+ } else if (priority == SDL_THREAD_PRIORITY_TIME_CRITICAL) {
value = -20;
} else {
value = 0;
diff --git a/src/thread/pthread/SDL_systhread.c b/src/thread/pthread/SDL_systhread.c
index adb7b77..4842d9c 100644
--- a/src/thread/pthread/SDL_systhread.c
+++ b/src/thread/pthread/SDL_systhread.c
@@ -275,6 +275,8 @@ SDL_SYS_SetThreadPriority(SDL_ThreadPriority priority)
if (priority == SDL_THREAD_PRIORITY_LOW) {
value = 19;
} else if (priority == SDL_THREAD_PRIORITY_HIGH) {
+ value = -10;
+ } else if (priority == SDL_THREAD_PRIORITY_TIME_CRITICAL) {
value = -20;
} else {
value = 0;
@@ -290,12 +292,15 @@ SDL_SYS_SetThreadPriority(SDL_ThreadPriority priority)
}
if (priority == SDL_THREAD_PRIORITY_LOW) {
sched.sched_priority = sched_get_priority_min(policy);
- } else if (priority == SDL_THREAD_PRIORITY_HIGH) {
+ } else if (priority == SDL_THREAD_PRIORITY_TIME_CRITICAL) {
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 (priority == SDL_THREAD_PRIORITY_HIGH) {
+ sched.sched_priority += (max_priority - min_priority) / 4);
+ }
}
if (pthread_setschedparam(thread, policy, &sched) != 0) {
return SDL_SetError("pthread_setschedparam() failed");
diff --git a/src/thread/windows/SDL_systhread.c b/src/thread/windows/SDL_systhread.c
index 90036c9..251510d 100644
--- a/src/thread/windows/SDL_systhread.c
+++ b/src/thread/windows/SDL_systhread.c
@@ -231,6 +231,8 @@ SDL_SYS_SetThreadPriority(SDL_ThreadPriority priority)
value = THREAD_PRIORITY_LOWEST;
} else if (priority == SDL_THREAD_PRIORITY_HIGH) {
value = THREAD_PRIORITY_HIGHEST;
+ } else if (priority == SDL_THREAD_PRIORITY_TIME_CRITICAL) {
+ value = THREAD_PRIORITY_TIME_CRITICAL;
} else {
value = THREAD_PRIORITY_NORMAL;
}
diff --git a/test/testthread.c b/test/testthread.c
index efba681..4555a1e 100644
--- a/test/testthread.c
+++ b/test/testthread.c
@@ -38,6 +38,7 @@ getprioritystr(SDL_ThreadPriority priority)
case SDL_THREAD_PRIORITY_LOW: return "SDL_THREAD_PRIORITY_LOW";
case SDL_THREAD_PRIORITY_NORMAL: return "SDL_THREAD_PRIORITY_NORMAL";
case SDL_THREAD_PRIORITY_HIGH: return "SDL_THREAD_PRIORITY_HIGH";
+ case SDL_THREAD_PRIORITY_TIME_CRITICAL: return "SDL_THREAD_PRIORITY_TIME_CRITICAL";
}
return "???";
@@ -56,7 +57,7 @@ ThreadFunc(void *data)
if (testprio) {
SDL_Log("SDL_SetThreadPriority(%s):%d\n", getprioritystr(prio), SDL_SetThreadPriority(prio));
- if (++prio > SDL_THREAD_PRIORITY_HIGH)
+ if (++prio > SDL_THREAD_PRIORITY_TIME_CRITICAL)
prio = SDL_THREAD_PRIORITY_LOW;
}