xnu-3247.1.106.tar.gz

[apple/xnu.git] / libsyscall / wrappers / work_interval.c

diff --git a/libsyscall/wrappers/work_interval.c b/libsyscall/wrappers/work_interval.c
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+/*
+ * Copyright (c) 2015 Apple Inc. All rights reserved.
+ *
+ * @APPLE_LICENSE_HEADER_START@
+ *
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this
+ * file.
+ *
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ *
+ * @APPLE_LICENSE_HEADER_END@
+ */
+#include <sys/cdefs.h>
+#include <sys/types.h>
+#include <sys/work_interval.h>
+#include <mach/mach_time.h>
+#include <sys/errno.h>
+#include <stdlib.h>
+
+struct work_interval {
+       uint64_t thread_id;
+       uint64_t work_interval_id;
+};
+
+extern uint64_t __thread_selfid(void);
+
+/* Create a new work interval handle (currently for the current thread only). Flags is unused */
+int
+work_interval_create(work_interval_t *interval_handle, uint32_t flags __unused)
+{
+       int ret;
+       uint64_t work_interval_id;
+       work_interval_t handle;
+
+       ret = __work_interval_ctl(WORK_INTERVAL_OPERATION_CREATE, 0, &work_interval_id, sizeof(work_interval_id));
+       if (ret == -1) {
+               return ret;
+       }
+
+       handle = malloc(sizeof(*handle));
+       if (handle == NULL) {
+               errno = ENOMEM;
+               return -1;
+       }
+
+       handle->thread_id = __thread_selfid();
+       handle->work_interval_id = work_interval_id;
+
+       *interval_handle = handle;
+       return 0;
+}
+
+int
+work_interval_notify(work_interval_t interval_handle, uint64_t start, uint64_t finish, uint64_t deadline, uint64_t next_start, uint32_t flags)
+{
+       int ret;
+       uint64_t work_interval_id;
+       struct work_interval_notification notification = {
+               .start = start,
+               .finish = finish,
+               .deadline = deadline,
+               .next_start = next_start,
+               .flags = flags,
+               .unused1 = 0
+       };
+
+       if (interval_handle == NULL) {
+               errno = EINVAL;
+               return -1;
+       }
+
+       work_interval_id = interval_handle->work_interval_id;
+
+       ret = __work_interval_ctl(WORK_INTERVAL_OPERATION_NOTIFY, work_interval_id, &notification, sizeof(notification));
+       return ret;
+}
+
+int
+work_interval_notify_simple(work_interval_t interval_handle, uint64_t start, uint64_t deadline, uint64_t next_start)
+{
+       return work_interval_notify(interval_handle, start, mach_absolute_time(), deadline, next_start, 0);
+}
+
+int
+work_interval_destroy(work_interval_t interval_handle)
+{
+       int ret, saved_errno;
+       uint64_t work_interval_id;
+
+       if (interval_handle == NULL) {
+               errno = EINVAL;
+               return -1;
+       }
+
+       work_interval_id = interval_handle->work_interval_id;
+
+       ret = __work_interval_ctl(WORK_INTERVAL_OPERATION_DESTROY, work_interval_id, NULL, 0);
+       saved_errno = errno;
+       free(interval_handle);
+       errno = saved_errno;
+
+       return ret;
+}