281 lines
5.3 KiB
C
281 lines
5.3 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.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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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_Lock 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_EXECVP
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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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fcntl(_fd_read, F_SETFL, O_NONBLOCK);
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eina_lock_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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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_lock_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_lock_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_lock_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 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 (_evas_async_events_process_single() > 0) count++;
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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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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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}
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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_lock_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_lock_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_lock_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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