[Python-Dev] pthreads question: typedef ??? pthread_t and hacky return statements (original) (raw)

Mark Hammond MarkH@ActiveState.com
Fri, 18 Aug 2000 09:59:18 +1000

IOW, an x-plat TLS is going to be done at some point. If you need it now, then please do it now. That will help us immeasurably in the long run.

I just discovered the TLS code in the Mozilla source tree. This could be a good place to start.

The definitions are in mozilla/nsprpub/pr/include/prthread.h, and I include some of this file below... I can confirm this code works with Python - but I have no idea how hard it would be to distill it into Python!

Then-we-just-need-Tim-to-check-the-license-for-us ly,

Mark.

/*

[MarkH - it looks good to me - very open license] ...

/* ** This routine returns a new index for per-thread-private data table. ** The index is visible to all threads within a process. This index can ** be used with the PR_SetThreadPrivate() and PR_GetThreadPrivate() routines ** to save and retrieve data associated with the index for a thread. ** ** Each index is associationed with a destructor function ('dtor'). The function ** may be specified as NULL when the index is created. If it is not NULL, the ** function will be called when: ** - the thread exits and the private data for the associated index ** is not NULL, ** - new thread private data is set and the current private data is ** not NULL. ** ** The index independently maintains specific values for each binding thread. ** A thread can only get access to its own thread-specific-data. ** ** Upon a new index return the value associated with the index for all threads ** is NULL, and upon thread creation the value associated with all indices for ** that thread is NULL. ** ** Returns PR_FAILURE if the total number of indices will exceed the maximun ** allowed. */ typedef void (PR_CALLBACK *PRThreadPrivateDTOR)(void *priv);

NSPR_API(PRStatus) PR_NewThreadPrivateIndex( PRUintn *newIndex, PRThreadPrivateDTOR destructor);

/* ** Define some per-thread-private data. ** "tpdIndex" is an index into the per-thread private data table ** "priv" is the per-thread-private data ** ** If the per-thread private data table has a previously registered ** destructor function and a non-NULL per-thread-private data value, ** the destructor function is invoked. ** ** This can return PR_FAILURE if the index is invalid. */ NSPR_API(PRStatus) PR_SetThreadPrivate(PRUintn tpdIndex, void *priv);

/* ** Recover the per-thread-private data for the current thread. "tpdIndex" is ** the index into the per-thread private data table. ** ** The returned value may be NULL which is indistinguishable from an error ** condition. ** ** A thread can only get access to its own thread-specific-data. / NSPR_API(void) PR_GetThreadPrivate(PRUintn tpdIndex);