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.
diff --git a/Python/thread_pthread.h b/Python/thread_pthread.h
index fd03e91..d718113 100644
--- a/Python/thread_pthread.h
+++ b/Python/thread_pthread.h
@@ -272,7 +272,7 @@
}
}
- dprintf(("PyThread_allocate_lock() -> %lx\n", (long)lock));
+ dprintf(("PyThread_allocate_lock() -> %p\n", lock));
return (PyThread_type_lock) lock;
}
@@ -281,7 +281,7 @@
pthread_lock *thelock = (pthread_lock *)lock;
int status, error = 0;
- dprintf(("PyThread_free_lock(%lx) called\n", (long)lock));
+ dprintf(("PyThread_free_lock(%p) called\n", lock));
status = pthread_mutex_destroy( &thelock->mut );
CHECK_STATUS("pthread_mutex_destroy");
@@ -298,7 +298,7 @@
pthread_lock *thelock = (pthread_lock *)lock;
int status, error = 0;
- dprintf(("PyThread_acquire_lock(%lx, %d) called\n", (long)lock, waitflag));
+ dprintf(("PyThread_acquire_lock(%p, %d) called\n", lock, waitflag));
status = pthread_mutex_lock( &thelock->mut );
CHECK_STATUS("pthread_mutex_lock[1]");
@@ -325,7 +325,7 @@
success = 1;
}
if (error) success = 0;
- 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;
}
@@ -334,7 +334,7 @@
pthread_lock *thelock = (pthread_lock *)lock;
int status, error = 0;
- dprintf(("PyThread_release_lock(%lx) called\n", (long)lock));
+ dprintf(("PyThread_release_lock(%p) called\n", lock));
status = pthread_mutex_lock( &thelock->mut );
CHECK_STATUS("pthread_mutex_lock[3]");
@@ -382,7 +382,7 @@
sema = NULL;
}
}
- dprintf(("PyThread_allocate_sema() -> %lx\n", (long) sema));
+ dprintf(("PyThread_allocate_sema() -> %p\n", sema));
return (PyThread_type_sema) sema;
}
@@ -391,7 +391,7 @@
int status, error = 0;
struct semaphore *thesema = (struct semaphore *) sema;
- dprintf(("PyThread_free_sema(%lx) called\n", (long) sema));
+ dprintf(("PyThread_free_sema(%p) called\n", sema));
status = pthread_cond_destroy(&thesema->cond);
CHECK_STATUS("pthread_cond_destroy");
status = pthread_mutex_destroy(&thesema->mutex);
@@ -404,7 +404,7 @@
int status, error = 0, success;
struct semaphore *thesema = (struct semaphore *) sema;
- dprintf(("PyThread_down_sema(%lx, %d) called\n", (long) sema, waitflag));
+ dprintf(("PyThread_down_sema(%p, %d) called\n", sema, waitflag));
status = pthread_mutex_lock(&thesema->mutex);
CHECK_STATUS("pthread_mutex_lock");
if (waitflag) {
@@ -424,7 +424,7 @@
success = 0;
status = pthread_mutex_unlock(&thesema->mutex);
CHECK_STATUS("pthread_mutex_unlock");
- dprintf(("PyThread_down_sema(%lx) return\n", (long) sema));
+ dprintf(("PyThread_down_sema(%p) return\n", sema));
return success;
}
@@ -433,7 +433,7 @@
int status, error = 0;
struct semaphore *thesema = (struct semaphore *) sema;
- dprintf(("PyThread_up_sema(%lx)\n", (long) sema));
+ dprintf(("PyThread_up_sema(%p)\n", sema));
status = pthread_mutex_lock(&thesema->mutex);
CHECK_STATUS("pthread_mutex_lock");
thesema->value++;