Hello
I was looking at extending my Basic Block Vector generating plugin so that
it can handle multi-threaded apps.
To do this properly, it would be nice if it were possible to be notified
whenever a thread-change happened. That way the statistics from the
various threads could be kept separately.
I looked through the code, and it didn't look like functionality existed
for this already.
I've attached a patch that implements registering a thread callback, but
I'm not sure if this is the best way to accomplish this. Also, it does
make some intrusive changes to the core so I wanted to see what opinions
people have on if this is useful or not.
Thanks,
Vince
--- ./include/pub_tool_tooliface.h.orig 2008-02-20 17:22:26.000000000 -0500
+++ ./include/pub_tool_tooliface.h 2008-02-20 17:40:22.000000000 -0500
@@ -446,6 +446,8 @@
function here. */
extern void VG_(needs_final_IR_tidy_pass) ( IRSB*(*final_tidy)(IRSB*) );
+extern void VG_(needs_thread_callback) (void(*thread_switch) (ThreadId));
+
/* ------------------------------------------------------------------ */
/* Core events to track */
--- ./coregrind/m_scheduler/scheduler.c.orig 2008-02-20 17:29:34.000000000
-0500
+++ ./coregrind/m_scheduler/scheduler.c 2008-02-20 17:47:42.000000000 -0500
@@ -945,6 +945,9 @@
VG_(message)(Vg_DebugMsg, "thread %d: running for %d bbs",
tid, VG_(dispatch_ctr) - 1 );
+ if (VG_(needs).thread_callback)
+ (VG_(tdict).tool_thread_callback) ( tid );
+
trc = run_thread_for_a_while ( tid );
if (VG_(clo_trace_sched) && VG_(clo_verbosity) > 2) {
--- ./coregrind/m_tooliface.c.orig 2008-02-20 16:33:45.000000000 -0500
+++ ./coregrind/m_tooliface.c 2008-02-20 17:37:08.000000000 -0500
@@ -94,7 +94,8 @@
.data_syms = False,
.malloc_replacement = False,
.xml_output = False,
- .final_IR_tidy_pass = False
+ .final_IR_tidy_pass = False,
+ .thread_callback = False,
};
/* static */
@@ -217,6 +218,14 @@
VG_(tdict).tool_handle_client_request = handle;
}
+void VG_(needs_thread_callback)(
+ void(*thread_switch) (ThreadID)
+)
+{
+ VG_(needs).thread_callback = True;
+ VG_(tdict).tool_thread_callback=thread_switch;
+}
+
void VG_(needs_syscall_wrapper)(
void(*pre) (ThreadId, UInt),
void(*post)(ThreadId, UInt, SysRes res)
--- ./coregrind/pub_core_tooliface.h.orig 2008-02-20 17:08:00.000000000
-0500
+++ ./coregrind/pub_core_tooliface.h 2008-02-20 17:39:47.000000000 -0500
@@ -92,6 +92,7 @@
Bool malloc_replacement;
Bool xml_output;
Bool final_IR_tidy_pass;
+ Bool thread_callback;
}
VgNeeds;
@@ -160,6 +161,9 @@
// VG_(needs).final_IR_tidy_pass
IRSB* (*tool_final_IR_tidy_pass) (IRSB*);
+ // VG_(needs).thread_callback
+ void (*tool_thread_callback) (ThreadId);
+
// -- Event tracking functions ------------------------------------
void (*track_new_mem_startup) (Addr, SizeT, Bool, Bool, Bool);
void (*track_new_mem_stack_signal)(Addr, SizeT);
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