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v0.5.1
https://github.com/python/cpython
09 December 2020, 11:06:31 UTC
Revision 5a3a71dddbe80edc75a3a74ce3b7978cf8635901 authored by Victor Stinner on 19 March 2020, 16:40:12 UTC, committed by GitHub on 19 March 2020, 16:40:12 UTC 
bpo-40010: Optimize signal handling in multithreaded applications (GH-19067)
 
If a thread different than the main thread gets a signal, the
bytecode evaluation loop is no longer interrupted at each bytecode
instruction to check for pending signals which cannot be handled.
Only the main thread of the main interpreter can handle signals.

Previously, the bytecode evaluation loop was interrupted at each
instruction until the main thread handles signals.

Changes:

* COMPUTE_EVAL_BREAKER() and SIGNAL_PENDING_SIGNALS() no longer set
  eval_breaker to 1 if the current thread cannot handle signals.
* take_gil() now always recomputes eval_breaker.
1 parent 77248a2
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Tip revision: 5a3a71dddbe80edc75a3a74ce3b7978cf8635901 authored by Victor Stinner on 19 March 2020, 16:40:12 UTC
bpo-40010: Optimize signal handling in multithreaded applications (GH-19067)
Tip revision: 5a3a71d
pyexpat.h 
/* Stuff to export relevant 'expat' entry points from pyexpat to other
 * parser modules, such as cElementTree. */

/* note: you must import expat.h before importing this module! */

#define PyExpat_CAPI_MAGIC  "pyexpat.expat_CAPI 1.1"
#define PyExpat_CAPSULE_NAME "pyexpat.expat_CAPI"

struct PyExpat_CAPI
{
    char* magic; /* set to PyExpat_CAPI_MAGIC */
    int size; /* set to sizeof(struct PyExpat_CAPI) */
    int MAJOR_VERSION;
    int MINOR_VERSION;
    int MICRO_VERSION;
    /* pointers to selected expat functions.  add new functions at
       the end, if needed */
    const XML_LChar * (*ErrorString)(enum XML_Error code);
    enum XML_Error (*GetErrorCode)(XML_Parser parser);
    XML_Size (*GetErrorColumnNumber)(XML_Parser parser);
    XML_Size (*GetErrorLineNumber)(XML_Parser parser);
    enum XML_Status (*Parse)(
        XML_Parser parser, const char *s, int len, int isFinal);
    XML_Parser (*ParserCreate_MM)(
        const XML_Char *encoding, const XML_Memory_Handling_Suite *memsuite,
        const XML_Char *namespaceSeparator);
    void (*ParserFree)(XML_Parser parser);
    void (*SetCharacterDataHandler)(
        XML_Parser parser, XML_CharacterDataHandler handler);
    void (*SetCommentHandler)(
        XML_Parser parser, XML_CommentHandler handler);
    void (*SetDefaultHandlerExpand)(
        XML_Parser parser, XML_DefaultHandler handler);
    void (*SetElementHandler)(
        XML_Parser parser, XML_StartElementHandler start,
        XML_EndElementHandler end);
    void (*SetNamespaceDeclHandler)(
        XML_Parser parser, XML_StartNamespaceDeclHandler start,
        XML_EndNamespaceDeclHandler end);
    void (*SetProcessingInstructionHandler)(
        XML_Parser parser, XML_ProcessingInstructionHandler handler);
    void (*SetUnknownEncodingHandler)(
        XML_Parser parser, XML_UnknownEncodingHandler handler,
        void *encodingHandlerData);
    void (*SetUserData)(XML_Parser parser, void *userData);
    void (*SetStartDoctypeDeclHandler)(XML_Parser parser,
                                       XML_StartDoctypeDeclHandler start);
    enum XML_Status (*SetEncoding)(XML_Parser parser, const XML_Char *encoding);
    int (*DefaultUnknownEncodingHandler)(
        void *encodingHandlerData, const XML_Char *name, XML_Encoding *info);
    /* might be none for expat < 2.1.0 */
    int (*SetHashSalt)(XML_Parser parser, unsigned long hash_salt);
    /* always add new stuff to the end! */
};
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