Implement base::this_thread::yield & sleep_for().

src/base/CMakeLists.txt

@@ -1,6 +1,18 @@
 # ASEPRITE
 # Copyright (C) 2001-2012  David Capello
 
+CHECK_C_SOURCE_COMPILES("
+#include <unistd.h>
+int main() {
+  sched_yield();
+  return 0;
+}
+" HAVE_SCHED_YIELD)
+
+if(HAVE_SCHED_YIELD)
+  add_definitions(-DHAVE_SCHED_YIELD)
+endif()
+
 add_library(base-lib
   convert_to.cpp
   errno_string.cpp

src/base/thread.cpp

@@ -15,6 +15,12 @@
   #include <pthread.h>          // Use pthread library in Unix-like systems
 #endif
 
+#if defined(HAVE_SCHED_YIELD) && defined(_POSIX_PRIORITY_SCHEDULING)
+  #include <unistd.h>
+#elif !defined(WIN32)
+  #include <sys/time.h>
+#endif
+
 namespace {
 
 #ifdef WIN32
@@ -116,17 +122,32 @@ void base::thread::details::thread_proxy(void* data)
 void base::this_thread::yield()
 {
 #ifdef WIN32
+
   ::Sleep(0);
+
+#elif defined(HAVE_SCHED_YIELD) && defined(_POSIX_PRIORITY_SCHEDULING)
+
+  sched_yield();
+
 #else
-  // TODO
+
+  struct timeval timeout;
+  timeout.tv_sec = 0;
+  timeout.tv_usec = 0;
+  select(0, NULL, NULL, NULL, &timeout);
+
 #endif
 }
 
-void base::this_thread::sleep_for(int milliseconds)
+void base::this_thread::sleep_for(double seconds)
 {
 #ifdef WIN32
-  ::Sleep(milliseconds);
+
+  ::Sleep(seconds * 1000.0);
+
 #else
-  // TODO
+
+  usleep(seconds * 1000000.0);
+
 #endif
 }

src/base/thread.h

@@ -89,7 +89,7 @@ namespace base {                // Based on C++0x threads lib
   namespace this_thread
   {
     void yield();
-    void sleep_for(int milliseconds);
+    void sleep_for(double seconds);
   }
 
   // This class joins the thread in its destructor.