mirror of https://github.com/python/cpython.git
101 lines
2.9 KiB
C
101 lines
2.9 KiB
C
/***********************************************************
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Copyright 1991, 1992, 1993 by Stichting Mathematisch Centrum,
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Amsterdam, The Netherlands.
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All Rights Reserved
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Permission to use, copy, modify, and distribute this software and its
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documentation for any purpose and without fee is hereby granted,
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provided that the above copyright notice appear in all copies and that
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both that copyright notice and this permission notice appear in
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supporting documentation, and that the names of Stichting Mathematisch
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Centrum or CWI not be used in advertising or publicity pertaining to
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distribution of the software without specific, written prior permission.
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STICHTING MATHEMATISCH CENTRUM DISCLAIMS ALL WARRANTIES WITH REGARD TO
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THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
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FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH CENTRUM BE LIABLE
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FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
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OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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******************************************************************/
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/* Interface to random parts in ceval.c */
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object *call_object PROTO((object *, object *));
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object *getglobals PROTO((void));
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object *getlocals PROTO((void));
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void printtraceback PROTO((object *));
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void flushline PROTO((void));
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/* Interface for threads.
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A module that plans to do a blocking system call (or something else
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that lasts a long time and doesn't touch Python data) can allow other
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threads to run as follows:
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...preparations here...
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BGN_SAVE
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...blocking system call here...
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END_SAVE
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...interpretr result here...
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The BGN_SAVE/END_SAVE pair expands to a {}-surrounded block.
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To leave the block in the middle (e.g., with return), you must insert
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a line containing RET_SAVE before the return, e.g.
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if (...premature_exit...) {
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RET_SAVE
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err_errno(IOError);
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return NULL;
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}
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An alternative is:
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RET_SAVE
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if (...premature_exit...) {
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err_errno(IOError);
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return NULL;
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}
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RES_SAVE
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For convenience, that the value of 'errno' is restored across
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END_SAVE and RET_SAVE.
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WARNING: NEVER NEST CALLS TO BGN_SAVE AND END_SAVE!!!
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The function init_save_thread() should be called only from
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initthread() in "threadmodule.c".
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Note that not yet all candidates have been converted to use this
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mechanism!
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*/
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extern void init_save_thread PROTO((void));
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extern object *save_thread PROTO((void));
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extern void restore_thread PROTO((object *));
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#ifdef USE_THREAD
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#define BGN_SAVE { \
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object *_save; \
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_save = save_thread();
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#define RET_SAVE restore_thread(_save);
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#define RES_SAVE _save = save_thread();
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#define END_SAVE restore_thread(_save); \
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}
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#else /* !USE_THREAD */
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#define BGN_SAVE {
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#define RET_SAVE
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#define RES_SAVE
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#define END_SAVE }
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#endif /* !USE_THREAD */
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