* Added optional spinlock contention measurement feature. Enabled when

B_DEBUG_SPINLOCK_CONTENTION is defined to 1. It typedefs spinlock to a
  structure (thus breaking BeOS binary compatibility), containing a
  counter which is incremented whenever a thread has to wait for the
  spinlock.
* Added macros for spinlock initialization and access and changed
  code using spinlocks accordingly. This breaks compilation for BeOS --
  the macros should be defined in the respective compatibility wrappers.
* Added generic syscall to get the spinlock counters for the thread and
  the team spinlocks.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@25752 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/system/kernel/debug/debug.cpp

@@ -54,7 +54,7 @@ static bool sBlueScreenEnabled = false;
 	// must always be false on startup
 static bool sDebugScreenEnabled = false;
 static bool sBlueScreenOutput = true;
-static spinlock sSpinlock = 0;
+static spinlock sSpinlock = B_SPINLOCK_INITIALIZER;
 static int32 sDebuggerOnCPU = -1;
 
 static sem_id sSyslogNotify = -1;