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bpo-33015: Add a wrapper for thread function in PyThread_start_new_thread #6008

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Merged
vstinner merged 4 commits into from
Nov 30, 2018
Merged

bpo-33015: Add a wrapper for thread function in PyThread_start_new_thread #6008

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d3a9724
Add a wrapper for thread function in PyThread_start_new_thread
siddhesh Oct 25, 2018
4d5b9b0
Cleanup code
vstinner Nov 30, 2018
6d0bade
More cleanup
vstinner Nov 30, 2018
1499f46
fix typo in the NEWS entry
vstinner Nov 30, 2018
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More cleanup 
* Rename "fn" to "callback"
* Add { ... } to if
* Remove useless cast
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@vstinner
vstinner committed Nov 30, 2018
commit 6d0bade9431ccf1e15bfa0750f99342b51947b02
6 changes: 3 additions & 3 deletions Misc/NEWS.d/next/Build/2018-08-24-09-48-25.bpo-33015.s21y74.rst
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Original file line number Diff line number Diff line change
@@ -1,3 +1,3 @@
Add a wrapper for the thread function argument in
`PyThread_start_new_thread` to avoid an incompatible cast warning with gcc
8.
Fix an undefined behaviour in the pthread implementation of
:c:func:`PyThread_start_new_thread`: add a function wrapper to always return
``NULL`.
13 changes: 7 additions & 6 deletions Python/thread_pthread.h
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Expand Up @@ -210,28 +210,29 @@ PyThread_start_new_thread(void (*func)(void *), void *arg)
pthread_attr_setscope(&attrs, PTHREAD_SCOPE_SYSTEM);
#endif

pythread_callback *fn = PyMem_RawMalloc(sizeof(pythread_callback));
pythread_callback *callback = PyMem_RawMalloc(sizeof(pythread_callback));

if (fn == NULL)
if (callback == NULL) {
return PYTHREAD_INVALID_THREAD_ID;
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}

fn->func = func;
fn->arg = arg;
callback->func = func;
callback->arg = arg;

status = pthread_create(&th,
#if defined(THREAD_STACK_SIZE) || defined(PTHREAD_SYSTEM_SCHED_SUPPORTED)
&attrs,
#else
(pthread_attr_t*)NULL,
#endif
pythread_wrapper, fn);
pythread_wrapper, callback);

#if defined(THREAD_STACK_SIZE) || defined(PTHREAD_SYSTEM_SCHED_SUPPORTED)
pthread_attr_destroy(&attrs);
#endif

if (status != 0) {
PyMem_RawFree((void *)fn);
PyMem_RawFree(callback);
return PYTHREAD_INVALID_THREAD_ID;
}

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