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50 lines
1.4 KiB
50 lines
1.4 KiB
4 months ago
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/*
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Logic for a better replacement of PyGILState_Ensure().
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This version is ready to handle the case of a non-Python-started
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thread in which we do a large number of calls to CFFI callbacks. If
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we were to rely on PyGILState_Ensure() for that, we would constantly
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be creating and destroying PyThreadStates---it is slow, and
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PyThreadState_Delete() will actually walk the list of all thread
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states, making it O(n). :-(
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This version only creates one PyThreadState object the first time we
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see a given thread, and keep it alive until the thread is really
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shut down, using a destructor on the tls key.
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*/
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#include <pthread.h>
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#include "misc_thread_common.h"
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static pthread_key_t cffi_tls_key;
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static void init_cffi_tls(void)
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{
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if (pthread_key_create(&cffi_tls_key, &cffi_thread_shutdown) != 0)
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PyErr_SetString(PyExc_OSError, "pthread_key_create() failed");
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}
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static struct cffi_tls_s *_make_cffi_tls(void)
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{
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void *p = calloc(1, sizeof(struct cffi_tls_s));
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if (p == NULL)
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return NULL;
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if (pthread_setspecific(cffi_tls_key, p) != 0) {
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free(p);
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return NULL;
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}
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return p;
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}
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static struct cffi_tls_s *get_cffi_tls(void)
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{
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void *p = pthread_getspecific(cffi_tls_key);
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if (p == NULL)
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p = _make_cffi_tls();
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return (struct cffi_tls_s *)p;
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}
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#define save_errno save_errno_only
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#define restore_errno restore_errno_only
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