* Introduced a per-team counter that is incremented whenever an image

is created or deleted (or exec*() has been invoked). The counter is
  sent with several debugger messages.
* Track the image event counter that is used when samples are added to
  the profiling buffer. If the current team counter differs, we flush
  the buffer first (sending an update message to the debugger), so that
  the debugger has a chance to match the addresses to the correct images.
* Disable profiling for a thread while it runs in the debugger support
  code. This fixes potential deadlocks which could occur when a
  profiling timer event occurred that would require the buffer to be
  flushed while the thread was just sending something to the debugger or
  waiting for a command. As it turns out, this is not sufficient either,
  since we should never try to flush the buffer when the timer event
  occurred in the kernel, since the thread might hold a lock that the
  debugger thread could try to acquire. Will implement a more general
  solution later.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@27656 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/os/kernel/debugger.h

@@ -371,9 +371,7 @@ typedef struct {
 
 typedef struct {
 	status_t			error;
-	int32				profile_event;	// number of the last event influencing
-										// profiling (e.g. image
-										// created/deleted)
+	int32				image_event;	// number of the last image event
 	bigtime_t			interval;		// actual sample interval (might
 										// differ from the requested one)
 } debug_nub_start_profiler_reply;
@@ -515,6 +513,7 @@ typedef struct {
 
 typedef struct {
 	debug_origin	origin;
+	int32			image_event;	// number of the image event
 } debug_team_exec;
 
 // B_DEBUGGER_MESSAGE_THREAD_CREATED
@@ -535,6 +534,7 @@ typedef struct {
 typedef struct {
 	debug_origin	origin;
 	image_info		info;			// info for the image
+	int32			image_event;	// number of the image event
 } debug_image_created;
 
 // B_DEBUGGER_MESSAGE_IMAGE_DELETED
@@ -542,17 +542,17 @@ typedef struct {
 typedef struct {
 	debug_origin	origin;
 	image_info		info;			// info for the image
+	int32			image_event;	// number of the image event
 } debug_image_deleted;
 
 // B_DEBUGGER_MESSAGE_PROFILER_UPDATE
 
 typedef struct {
 	debug_origin		origin;
-	int32				profile_event;		// number of the last event
-											// influencing profiling (e.g.
-											// image created/deleted); all
-											// samples were recorded after this
-											// event and before the next one
+	int32				image_event;		// number of the last image event;
+											// all samples were recorded after
+											// this event and before the next
+											// one
 	int32				stack_depth;		// number of return addresses per
 											// tick
 	int32				sample_count;		// number of samples in the buffer