Diff: semaphore.cpp

Revision:

9:2fe93daa2106

Parent:

3:e5d5e2fe4bf6

Child:

10:d40c70908bf0

--- a/semaphore.cpp	Mon Jan 10 22:57:59 2011 +0000
+++ b/semaphore.cpp	Tue Feb 22 22:57:44 2011 +0000
@@ -5,35 +5,33 @@
 
 #include "semaphore.h"
 
-  Semaphore::Semaphore(): s(SemFree) {};
-  
-  bool Semaphore::take(bool block)
-  {
+Semaphore::Semaphore(): s(SemFree) {};
+bool Semaphore::_abort=false;
+
+bool Semaphore::take(bool block) {
+    if (_abort)
+        block=false;
     int oldval;
 #if defined(TARGET_LPC1768) // on Cortex-M3 we can use ldrex/strex
     do {
-      // read the semaphore value
-      oldval = __ldrex(&s);
-      // loop again if it is locked and we are blocking
-      // or setting it with strex failed
-    }
-    while ( (block && oldval == SemTaken) || __strex(SemTaken, &s) != 0 );
+        // read the semaphore value
+        oldval = __ldrex(&s);
+        // loop again if it is locked and we are blocking
+        // or setting it with strex failed
+    } while ( (block && oldval == SemTaken) || __strex(SemTaken, &s) != 0 );
     if ( !block ) __clrex(); // clear exclusive lock set by ldrex
 #else // on arm7 there's only swp
     do {
-      // swp sets the pointed data to the given value and returns the previous one
-      oldval = __swp(SemTaken, &s);
-      // if blocking, loop until the previous value becomes 0
-      // which would mean we have successfully taken the lock
-    }
-    while (block && oldval == SemTaken);
+        // swp sets the pointed data to the given value and returns the previous one
+        oldval = __swp(SemTaken, &s);
+        // if blocking, loop until the previous value becomes 0
+        // which would mean we have successfully taken the lock
+    } while (block && oldval == SemTaken);
 #endif
     return oldval == SemFree;
-  }
-  
-  // release the semaphore
-  void Semaphore::release()
-  {
+}
+
+// release the semaphore
+void Semaphore::release() {
     s = SemFree;
-  }
-  
\ No newline at end of file
+}