forked from enlightenment/efl
427 lines
8.7 KiB
C
427 lines
8.7 KiB
C
#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#ifndef _MSC_VER
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# include <unistd.h>
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#endif
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#include <fcntl.h>
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#include <errno.h>
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#include "evas_common_private.h"
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#include "evas_private.h"
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typedef struct _Evas_Event_Async Evas_Event_Async;
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struct _Evas_Event_Async
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{
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const void *target;
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void *event_info;
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Evas_Async_Events_Put_Cb func;
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Evas_Callback_Type type;
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};
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typedef struct _Evas_Safe_Call Evas_Safe_Call;
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struct _Evas_Safe_Call
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{
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Eina_Condition c;
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Eina_Lock m;
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int current_id;
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};
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static Eina_Lock _thread_mutex;
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static Eina_Condition _thread_cond;
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static Eina_Lock _thread_feedback_mutex;
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static Eina_Condition _thread_feedback_cond;
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static int _thread_loop = 0;
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static Eina_Spinlock _thread_id_lock;
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static int _thread_id = -1;
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static int _thread_id_max = 0;
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static int _thread_id_update = 0;
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static int _fd_write = -1;
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static int _fd_read = -1;
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static pid_t _fd_pid = 0;
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static Eina_Spinlock async_lock;
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static Eina_Inarray async_queue;
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static Evas_Event_Async *async_queue_cache = NULL;
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static unsigned int async_queue_cache_max = 0;
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static int _init_evas_event = 0;
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Eina_Bool
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_evas_fd_close_on_exec(int fd)
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{
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#ifdef HAVE_FCNTL
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int flags;
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flags = fcntl(fd, F_GETFD);
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if (flags == -1)
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return EINA_FALSE;
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flags |= FD_CLOEXEC;
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if (fcntl(fd, F_SETFD, flags) == -1)
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return EINA_FALSE;
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return EINA_TRUE;
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#else
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(void) fd;
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return EINA_FALSE;
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#endif
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}
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int
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evas_async_events_init(void)
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{
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int filedes[2];
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_init_evas_event++;
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if (_init_evas_event > 1) return _init_evas_event;
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_fd_pid = getpid();
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if (pipe(filedes) == -1)
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{
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_init_evas_event = 0;
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return 0;
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}
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_evas_fd_close_on_exec(filedes[0]);
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_evas_fd_close_on_exec(filedes[1]);
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_fd_read = filedes[0];
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_fd_write = filedes[1];
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#ifdef HAVE_FCNTL
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fcntl(_fd_read, F_SETFL, O_NONBLOCK);
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#endif
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eina_spinlock_new(&async_lock);
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eina_inarray_step_set(&async_queue, sizeof (Eina_Inarray), sizeof (Evas_Event_Async), 16);
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eina_lock_new(&_thread_mutex);
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eina_condition_new(&_thread_cond, &_thread_mutex);
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eina_lock_new(&_thread_feedback_mutex);
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eina_condition_new(&_thread_feedback_cond, &_thread_feedback_mutex);
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eina_spinlock_new(&_thread_id_lock);
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return _init_evas_event;
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}
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int
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evas_async_events_shutdown(void)
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{
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_init_evas_event--;
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if (_init_evas_event > 0) return _init_evas_event;
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eina_condition_free(&_thread_cond);
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eina_lock_free(&_thread_mutex);
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eina_condition_free(&_thread_feedback_cond);
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eina_lock_free(&_thread_feedback_mutex);
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eina_spinlock_free(&_thread_id_lock);
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eina_spinlock_free(&async_lock);
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eina_inarray_flush(&async_queue);
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free(async_queue_cache);
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close(_fd_read);
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close(_fd_write);
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_fd_read = -1;
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_fd_write = -1;
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return _init_evas_event;
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}
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static void
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_evas_async_events_fork_handle(void)
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{
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int i, count = _init_evas_event;
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if (getpid() == _fd_pid) return;
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for (i = 0; i < count; i++) evas_async_events_shutdown();
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for (i = 0; i < count; i++) evas_async_events_init();
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}
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EAPI int
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evas_async_events_fd_get(void)
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{
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_evas_async_events_fork_handle();
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return _fd_read;
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}
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static int
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_evas_async_events_process_single(void)
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{
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int ret, wakeup;
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ret = read(_fd_read, &wakeup, sizeof(int));
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if (ret < 0)
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{
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switch (errno)
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{
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case EBADF:
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case EINVAL:
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case EIO:
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case EISDIR:
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_fd_read = -1;
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}
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return ret;
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}
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if (ret == sizeof(int))
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{
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Evas_Event_Async *ev;
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unsigned int len, max;
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int nr;
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eina_spinlock_take(&async_lock);
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ev = async_queue.members;
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async_queue.members = async_queue_cache;
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async_queue_cache = ev;
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max = async_queue.max;
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async_queue.max = async_queue_cache_max;
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async_queue_cache_max = max;
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len = async_queue.len;
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async_queue.len = 0;
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eina_spinlock_release(&async_lock);
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DBG("Evas async events queue length: %u", len);
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nr = len;
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while (len > 0)
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{
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if (ev->func) ev->func((void *)ev->target, ev->type, ev->event_info);
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ev++;
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len--;
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}
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return nr;
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}
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return 0;
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}
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EAPI int
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evas_async_events_process(void)
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{
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int nr, count = 0;
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if (_fd_read == -1) return 0;
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_evas_async_events_fork_handle();
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while ((nr = _evas_async_events_process_single()) > 0) count += nr;
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evas_cache_image_wakeup();
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return count;
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}
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static void
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_evas_async_events_fd_blocking_set(Eina_Bool blocking)
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{
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#ifdef HAVE_FCNTL
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long flags = fcntl(_fd_read, F_GETFL);
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if (blocking) flags &= ~O_NONBLOCK;
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else flags |= O_NONBLOCK;
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fcntl(_fd_read, F_SETFL, flags);
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#else
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(void) blocking;
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#endif
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}
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EAPI int
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evas_async_events_process_blocking(void)
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{
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int ret;
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_evas_async_events_fork_handle();
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_evas_async_events_fd_blocking_set(EINA_TRUE);
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ret = _evas_async_events_process_single();
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evas_cache_image_wakeup(); /* FIXME: is this needed ? */
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_evas_async_events_fd_blocking_set(EINA_FALSE);
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return ret;
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}
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EAPI Eina_Bool
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evas_async_events_put(const void *target, Evas_Callback_Type type, void *event_info, Evas_Async_Events_Put_Cb func)
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{
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Evas_Event_Async *ev;
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unsigned int count;
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Eina_Bool ret;
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if (!func) return EINA_FALSE;
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if (_fd_write == -1) return EINA_FALSE;
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_evas_async_events_fork_handle();
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eina_spinlock_take(&async_lock);
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count = async_queue.len;
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ev = eina_inarray_grow(&async_queue, 1);
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if (!ev)
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{
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eina_spinlock_release(&async_lock);
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return EINA_FALSE;
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}
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ev->func = func;
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ev->target = target;
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ev->type = type;
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ev->event_info = event_info;
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eina_spinlock_release(&async_lock);
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if (count == 0)
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{
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int wakeup = 1;
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ssize_t check;
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do
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{
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check = write(_fd_write, &wakeup, sizeof (int));
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}
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while ((check != sizeof (int)) &&
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((errno == EINTR) || (errno == EAGAIN)));
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if (check == sizeof (int)) ret = EINA_TRUE;
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else
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{
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ret = EINA_FALSE;
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switch (errno)
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{
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case EBADF:
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case EINVAL:
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case EIO:
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case EPIPE:
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_fd_write = -1;
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}
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}
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}
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else ret = EINA_TRUE;
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evas_cache_image_wakeup();
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return ret;
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}
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static void
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_evas_thread_main_loop_lock(void *target EINA_UNUSED,
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Evas_Callback_Type type EINA_UNUSED,
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void *event_info)
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{
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Evas_Safe_Call *call = event_info;
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eina_lock_take(&_thread_mutex);
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eina_lock_take(&call->m);
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_thread_id = call->current_id;
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eina_condition_broadcast(&call->c);
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eina_lock_release(&call->m);
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while (_thread_id_update != _thread_id)
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eina_condition_wait(&_thread_cond);
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eina_lock_release(&_thread_mutex);
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eina_main_loop_define();
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eina_lock_take(&_thread_feedback_mutex);
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_thread_id = -1;
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eina_condition_broadcast(&_thread_feedback_cond);
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eina_lock_release(&_thread_feedback_mutex);
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eina_condition_free(&call->c);
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eina_lock_free(&call->m);
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free(call);
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}
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EAPI int
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evas_thread_main_loop_begin(void)
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{
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Evas_Safe_Call *order;
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if (eina_main_loop_is())
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{
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return ++_thread_loop;
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}
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order = malloc(sizeof (Evas_Safe_Call));
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if (!order) return -1;
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eina_spinlock_take(&_thread_id_lock);
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order->current_id = ++_thread_id_max;
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if (order->current_id < 0)
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{
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_thread_id_max = 0;
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order->current_id = ++_thread_id_max;
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}
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eina_spinlock_release(&_thread_id_lock);
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eina_lock_new(&order->m);
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eina_condition_new(&order->c, &order->m);
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evas_async_events_put(NULL, 0, order, _evas_thread_main_loop_lock);
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eina_lock_take(&order->m);
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while (order->current_id != _thread_id)
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eina_condition_wait(&order->c);
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eina_lock_release(&order->m);
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eina_main_loop_define();
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_thread_loop = 1;
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return _thread_loop;
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}
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EAPI int
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evas_thread_main_loop_end(void)
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{
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int current_id;
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if (_thread_loop == 0)
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abort();
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/* until we unlock the main loop, this thread has the main loop id */
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if (!eina_main_loop_is())
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{
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ERR("Not in a locked thread !");
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return -1;
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}
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_thread_loop--;
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if (_thread_loop > 0)
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return _thread_loop;
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current_id = _thread_id;
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eina_lock_take(&_thread_mutex);
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_thread_id_update = _thread_id;
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eina_condition_broadcast(&_thread_cond);
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eina_lock_release(&_thread_mutex);
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eina_lock_take(&_thread_feedback_mutex);
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while (current_id == _thread_id && _thread_id != -1)
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eina_condition_wait(&_thread_feedback_cond);
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eina_lock_release(&_thread_feedback_mutex);
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return 0;
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}
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