| /* |
| 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 |