Merge pull request #23835 from alexrp/freebsd-libc

Support dynamically-linked FreeBSD libc when cross-compiling

1 files changed, 218 insertions, 0 deletions

diff --git a/lib/libc/include/generic-freebsd/sys/taskqueue.h b/lib/libc/include/generic-freebsd/sys/taskqueue.h
new file mode 100644
index 0000000000..3e755a5384
--- /dev/null
+++ b/lib/libc/include/generic-freebsd/sys/taskqueue.h
@@ -0,0 +1,218 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2000 Doug Rabson
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef _SYS_TASKQUEUE_H_
+#define _SYS_TASKQUEUE_H_
+
+#ifndef _KERNEL
+#error "no user-serviceable parts inside"
+#endif
+
+#include <sys/queue.h>
+#include <sys/_task.h>
+#include <sys/_cpuset.h>
+
+struct taskqueue;
+struct taskqgroup;
+struct proc;
+struct thread;
+
+enum taskqueue_callback_type {
+	TASKQUEUE_CALLBACK_TYPE_INIT,
+	TASKQUEUE_CALLBACK_TYPE_SHUTDOWN,
+};
+#define	TASKQUEUE_CALLBACK_TYPE_MIN	TASKQUEUE_CALLBACK_TYPE_INIT
+#define	TASKQUEUE_CALLBACK_TYPE_MAX	TASKQUEUE_CALLBACK_TYPE_SHUTDOWN
+#define	TASKQUEUE_NUM_CALLBACKS		TASKQUEUE_CALLBACK_TYPE_MAX + 1
+#define	TASKQUEUE_NAMELEN		32
+
+/* taskqueue_enqueue flags */
+#define	TASKQUEUE_FAIL_IF_PENDING	(1 << 0)
+#define	TASKQUEUE_FAIL_IF_CANCELING	(1 << 1)
+
+typedef void (*taskqueue_callback_fn)(void *context);
+
+/*
+ * A notification callback function which is called from
+ * taskqueue_enqueue().  The context argument is given in the call to
+ * taskqueue_create().  This function would normally be used to allow the
+ * queue to arrange to run itself later (e.g., by scheduling a software
+ * interrupt or waking a kernel thread).
+ */
+typedef void (*taskqueue_enqueue_fn)(void *context);
+
+struct taskqueue *taskqueue_create(const char *name, int mflags,
+				    taskqueue_enqueue_fn enqueue,
+				    void *context);
+int	taskqueue_start_threads(struct taskqueue **tqp, int count, int pri,
+	    const char *name, ...) __printflike(4, 5);
+int	taskqueue_start_threads_in_proc(struct taskqueue **tqp, int count,
+	    int pri, struct proc *p, const char *name, ...) __printflike(5, 6);
+int	taskqueue_start_threads_cpuset(struct taskqueue **tqp, int count,
+	    int pri, cpuset_t *mask, const char *name, ...) __printflike(5, 6);
+int	taskqueue_enqueue(struct taskqueue *queue, struct task *task);
+int	taskqueue_enqueue_flags(struct taskqueue *queue, struct task *task,
+	    int flags);
+int	taskqueue_enqueue_timeout(struct taskqueue *queue,
+	    struct timeout_task *timeout_task, int ticks);
+int	taskqueue_enqueue_timeout_sbt(struct taskqueue *queue,
+	    struct timeout_task *timeout_task, sbintime_t sbt, sbintime_t pr,
+	    int flags);
+int	taskqueue_poll_is_busy(struct taskqueue *queue, struct task *task);
+int	taskqueue_cancel(struct taskqueue *queue, struct task *task,
+	    u_int *pendp);
+int	taskqueue_cancel_timeout(struct taskqueue *queue,
+	    struct timeout_task *timeout_task, u_int *pendp);
+void	taskqueue_drain(struct taskqueue *queue, struct task *task);
+void	taskqueue_drain_timeout(struct taskqueue *queue,
+	    struct timeout_task *timeout_task);
+void	taskqueue_drain_all(struct taskqueue *queue);
+void	taskqueue_quiesce(struct taskqueue *queue);
+void	taskqueue_free(struct taskqueue *queue);
+void	taskqueue_run(struct taskqueue *queue);
+void	taskqueue_block(struct taskqueue *queue);
+void	taskqueue_unblock(struct taskqueue *queue);
+int	taskqueue_member(struct taskqueue *queue, struct thread *td);
+void	taskqueue_set_callback(struct taskqueue *queue,
+	    enum taskqueue_callback_type cb_type,
+	    taskqueue_callback_fn callback, void *context);
+
+#define TASK_INITIALIZER(priority, func, context)	\
+	{ .ta_priority = (priority),			\
+	  .ta_func = (func),				\
+	  .ta_context = (context) }
+
+/*
+ * Functions for dedicated thread taskqueues
+ */
+void	taskqueue_thread_loop(void *arg);
+void	taskqueue_thread_enqueue(void *context);
+
+/*
+ * Initialise a task structure.
+ */
+#define TASK_INIT_FLAGS(task, priority, func, context, flags) do {	\
+	(task)->ta_pending = 0;					\
+	(task)->ta_priority = (priority);			\
+	(task)->ta_flags = (flags);				\
+	(task)->ta_func = (func);				\
+	(task)->ta_context = (context);				\
+} while (0)
+
+#define TASK_INIT(t, p, f, c)	TASK_INIT_FLAGS(t, p, f, c, 0)
+
+void _timeout_task_init(struct taskqueue *queue,
+	    struct timeout_task *timeout_task, int priority, task_fn_t func,
+	    void *context);
+#define	TIMEOUT_TASK_INIT(queue, timeout_task, priority, func, context)	do { \
+	_Static_assert((priority) >= 0 && (priority) <= 255,	\
+	    "struct task priority is 8 bit in size");           \
+	_timeout_task_init(queue, timeout_task, priority, func, context); \
+} while (0)
+
+/*
+ * Declare a reference to a taskqueue.
+ */
+#define TASKQUEUE_DECLARE(name)			\
+extern struct taskqueue *taskqueue_##name
+
+/*
+ * Define and initialise a global taskqueue that uses sleep mutexes.
+ */
+#define TASKQUEUE_DEFINE(name, enqueue, context, init)			\
+									\
+struct taskqueue *taskqueue_##name;					\
+									\
+static void								\
+taskqueue_define_##name(void *arg)					\
+{									\
+	taskqueue_##name =						\
+	    taskqueue_create(#name, M_WAITOK, (enqueue), (context));	\
+	init;								\
+}									\
+									\
+SYSINIT(taskqueue_##name, SI_SUB_TASKQ, SI_ORDER_SECOND,		\
+	taskqueue_define_##name, NULL);					\
+									\
+struct __hack
+#define TASKQUEUE_DEFINE_THREAD(name)					\
+TASKQUEUE_DEFINE(name, taskqueue_thread_enqueue, &taskqueue_##name,	\
+	taskqueue_start_threads(&taskqueue_##name, 1, PWAIT,		\
+	"%s taskq", #name))
+
+/*
+ * Define and initialise a global taskqueue that uses spin mutexes.
+ */
+#define TASKQUEUE_FAST_DEFINE(name, enqueue, context, init)		\
+									\
+struct taskqueue *taskqueue_##name;					\
+									\
+static void								\
+taskqueue_define_##name(void *arg)					\
+{									\
+	taskqueue_##name =						\
+	    taskqueue_create_fast(#name, M_WAITOK, (enqueue),		\
+	    (context));							\
+	init;								\
+}									\
+									\
+SYSINIT(taskqueue_##name, SI_SUB_TASKQ, SI_ORDER_SECOND,		\
+	taskqueue_define_##name, NULL);					\
+									\
+struct __hack
+#define TASKQUEUE_FAST_DEFINE_THREAD(name)				\
+TASKQUEUE_FAST_DEFINE(name, taskqueue_thread_enqueue,			\
+	&taskqueue_##name, taskqueue_start_threads(&taskqueue_##name,	\
+	1, PWAIT, "%s taskq", #name))
+
+/*
+ * These queues are serviced by software interrupt handlers.  To enqueue
+ * a task, call taskqueue_enqueue(taskqueue_swi, &task) or
+ * taskqueue_enqueue(taskqueue_swi_giant, &task).
+ */
+TASKQUEUE_DECLARE(swi_giant);
+TASKQUEUE_DECLARE(swi);
+
+/*
+ * This queue is serviced by a kernel thread.  To enqueue a task, call
+ * taskqueue_enqueue(taskqueue_thread, &task).
+ */
+TASKQUEUE_DECLARE(thread);
+
+/*
+ * Queue for swi handlers dispatched from fast interrupt handlers.
+ * These are necessarily different from the above because the queue
+ * must be locked with spinlocks since sleep mutex's cannot be used
+ * from a fast interrupt handler context.
+ */
+TASKQUEUE_DECLARE(fast);
+struct taskqueue *taskqueue_create_fast(const char *name, int mflags,
+				    taskqueue_enqueue_fn enqueue,
+				    void *context);
+
+#endif /* !_SYS_TASKQUEUE_H_ */
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