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