Trent Mick <trentm@activestate.com>:

The common technique for printing out a pointer has been to cast to a long
and use the "%lx" printf modifier. This is incorrect on Win64 where casting
to a long truncates the pointer. The "%p" formatter should be used instead.

The problem as stated by Tim:
> Unfortunately, the C committee refused to define what %p conversion "looks
> like" -- they explicitly allowed it to be implementation-defined. Older
> versions of Microsoft C even stuck a colon in the middle of the address (in
> the days of segment+offset addressing)!

The result is that the hex value of a pointer will maybe/maybe not have a 0x
prepended to it.


Notes on the patch:

There are two main classes of changes:
- in the various repr() functions that print out pointers
- debugging printf's in the various thread_*.h files (these are why the
patch is large)


Closes SourceForge patch #100505.

1 files changed, 10 insertions, 10 deletions

diff --git a/Python/thread_cthread.h b/Python/thread_cthread.h
index 11370c5..1e60743 100644
--- a/Python/thread_cthread.h
+++ b/Python/thread_cthread.h
@@ -129,13 +129,13 @@ PyThread_type_lock PyThread_allocate_lock _P0()
 		free((void *) lock);
 		lock = 0;
 	}
-	dprintf(("PyThread_allocate_lock() -> %lx\n", (long)lock));
+	dprintf(("PyThread_allocate_lock() -> %p\n", lock));
 	return (PyThread_type_lock) lock;
 }
 
 void PyThread_free_lock _P1(lock, PyThread_type_lock lock)
 {
-	dprintf(("PyThread_free_lock(%lx) called\n", (long)lock));
+	dprintf(("PyThread_free_lock(%p) called\n", lock));
 	mutex_free(lock);
 }
 
@@ -143,20 +143,20 @@ int PyThread_acquire_lock _P2(lock, PyThread_type_lock lock, waitflag, int waitf
 {
 	int success = FALSE;
 
-	dprintf(("PyThread_acquire_lock(%lx, %d) called\n", (long)lock, waitflag));
+	dprintf(("PyThread_acquire_lock(%p, %d) called\n", lock, waitflag));
 	if (waitflag) { 	/* blocking */
 		mutex_lock(lock);
 		success = TRUE;
 	} else {		/* non blocking */
 		success = mutex_try_lock(lock);
 	}
-	dprintf(("PyThread_acquire_lock(%lx, %d) -> %d\n", (long)lock, waitflag, success));
+	dprintf(("PyThread_acquire_lock(%p, %d) -> %d\n", lock, waitflag, success));
 	return success;
 }
 
 void PyThread_release_lock _P1(lock, PyThread_type_lock lock)
 {
-	dprintf(("PyThread_release_lock(%lx) called\n", (long)lock));
+	dprintf(("PyThread_release_lock(%p) called\n", lock));
 	mutex_unlock((mutex_t )lock);
 }
 
@@ -181,23 +181,23 @@ PyThread_type_sema PyThread_allocate_sema _P1(value, int value)
 	if (!initialized)
 		PyThread_init_thread();
 
-	dprintf(("PyThread_allocate_sema() -> %lx\n", (long) sema));
+	dprintf(("PyThread_allocate_sema() -> %p\n", sema));
 	return (PyThread_type_sema) sema;
 }
 
 void PyThread_free_sema _P1(sema, PyThread_type_sema sema)
 {
-	dprintf(("PyThread_free_sema(%lx) called\n", (long) sema));
+	dprintf(("PyThread_free_sema(%p) called\n", sema));
 }
 
 int PyThread_down_sema _P2(sema, PyThread_type_sema sema, waitflag, int waitflag)
 {
-	dprintf(("PyThread_down_sema(%lx, %d) called\n", (long) sema, waitflag));
-	dprintf(("PyThread_down_sema(%lx) return\n", (long) sema));
+	dprintf(("PyThread_down_sema(%p, %d) called\n", sema, waitflag));
+	dprintf(("PyThread_down_sema(%p) return\n", sema));
 	return -1;
 }
 
 void PyThread_up_sema _P1(sema, PyThread_type_sema sema)
 {
-	dprintf(("PyThread_up_sema(%lx)\n", (long) sema));
+	dprintf(("PyThread_up_sema(%p)\n", sema));
 }