diff options
Diffstat (limited to 'include/libdrm/libsync.h')
-rw-r--r-- | include/libdrm/libsync.h | 148 |
1 files changed, 0 insertions, 148 deletions
diff --git a/include/libdrm/libsync.h b/include/libdrm/libsync.h deleted file mode 100644 index f1a2f96..0000000 --- a/include/libdrm/libsync.h +++ /dev/null @@ -1,148 +0,0 @@ -/* - * sync abstraction - * Copyright 2015-2016 Collabora Ltd. - * - * Based on the implementation from the Android Open Source Project, - * - * Copyright 2012 Google, Inc - * - * Permission is hereby granted, free of charge, to any person obtaining a - * copy of this software and associated documentation files (the "Software"), - * to deal in the Software without restriction, including without limitation - * the rights to use, copy, modify, merge, publish, distribute, sublicense, - * and/or sell copies of the Software, and to permit persons to whom the - * Software is furnished to do so, subject to the following conditions: - * - * The above copyright notice and this permission notice shall be included in - * all copies or substantial portions of the Software. - * - * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR - * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, - * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL - * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR - * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, - * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR - * OTHER DEALINGS IN THE SOFTWARE. - */ - -#ifndef _LIBSYNC_H -#define _LIBSYNC_H - -#include <assert.h> -#include <errno.h> -#include <stdint.h> -#include <string.h> -#include <sys/ioctl.h> -#include <sys/poll.h> -#include <unistd.h> - -#if defined(__cplusplus) -extern "C" { -#endif - -#ifndef SYNC_IOC_MERGE -/* duplicated from linux/sync_file.h to avoid build-time dependency - * on new (v4.7) kernel headers. Once distro's are mostly using - * something newer than v4.7 drop this and #include <linux/sync_file.h> - * instead. - */ -struct sync_merge_data { - char name[32]; - int32_t fd2; - int32_t fence; - uint32_t flags; - uint32_t pad; -}; -#define SYNC_IOC_MAGIC '>' -#define SYNC_IOC_MERGE _IOWR(SYNC_IOC_MAGIC, 3, struct sync_merge_data) -#endif - - -static inline int sync_wait(int fd, int timeout) -{ - struct pollfd fds = {0}; - int ret; - - fds.fd = fd; - fds.events = POLLIN; - - do { - ret = poll(&fds, 1, timeout); - if (ret > 0) { - if (fds.revents & (POLLERR | POLLNVAL)) { - errno = EINVAL; - return -1; - } - return 0; - } else if (ret == 0) { - errno = ETIME; - return -1; - } - } while (ret == -1 && (errno == EINTR || errno == EAGAIN)); - - return ret; -} - -static inline int sync_merge(const char *name, int fd1, int fd2) -{ - struct sync_merge_data data = {0}; - int ret; - - data.fd2 = fd2; - strncpy(data.name, name, sizeof(data.name)); - - do { - ret = ioctl(fd1, SYNC_IOC_MERGE, &data); - } while (ret == -1 && (errno == EINTR || errno == EAGAIN)); - - if (ret < 0) - return ret; - - return data.fence; -} - -/* accumulate fd2 into fd1. If *fd1 is not a valid fd then dup fd2, - * otherwise sync_merge() and close the old *fd1. This can be used - * to implement the pattern: - * - * init() - * { - * batch.fence_fd = -1; - * } - * - * // does *NOT* take ownership of fd - * server_sync(int fd) - * { - * if (sync_accumulate("foo", &batch.fence_fd, fd)) { - * ... error ... - * } - * } - */ -static inline int sync_accumulate(const char *name, int *fd1, int fd2) -{ - int ret; - - assert(fd2 >= 0); - - if (*fd1 < 0) { - *fd1 = dup(fd2); - return 0; - } - - ret = sync_merge(name, *fd1, fd2); - if (ret < 0) { - /* leave *fd1 as it is */ - return ret; - } - - close(*fd1); - *fd1 = ret; - - return 0; -} - -#if defined(__cplusplus) -} -#endif - -#endif |