diff options
author | José Pekkarinen <jose.pekkarinen@nokia.com> | 2016-05-18 13:18:31 +0300 |
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committer | José Pekkarinen <jose.pekkarinen@nokia.com> | 2016-05-18 13:42:15 +0300 |
commit | 437fd90c0250dee670290f9b714253671a990160 (patch) | |
tree | b871786c360704244a07411c69fb58da9ead4a06 /qemu/include/block/coroutine.h | |
parent | 5bbd6fe9b8bab2a93e548c5a53b032d1939eec05 (diff) |
These changes are the raw update to qemu-2.6.
Collission happened in the following patches:
migration: do cleanup operation after completion(738df5b9)
Bug fix.(1750c932f86)
kvmclock: add a new function to update env->tsc.(b52baab2)
The code provided by the patches was already in the upstreamed
version.
Change-Id: I3cc11841a6a76ae20887b2e245710199e1ea7f9a
Signed-off-by: José Pekkarinen <jose.pekkarinen@nokia.com>
Diffstat (limited to 'qemu/include/block/coroutine.h')
-rw-r--r-- | qemu/include/block/coroutine.h | 219 |
1 files changed, 0 insertions, 219 deletions
diff --git a/qemu/include/block/coroutine.h b/qemu/include/block/coroutine.h deleted file mode 100644 index 20c027a7f..000000000 --- a/qemu/include/block/coroutine.h +++ /dev/null @@ -1,219 +0,0 @@ -/* - * QEMU coroutine implementation - * - * Copyright IBM, Corp. 2011 - * - * Authors: - * Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> - * Kevin Wolf <kwolf@redhat.com> - * - * This work is licensed under the terms of the GNU LGPL, version 2 or later. - * See the COPYING.LIB file in the top-level directory. - * - */ - -#ifndef QEMU_COROUTINE_H -#define QEMU_COROUTINE_H - -#include <stdbool.h> -#include "qemu/typedefs.h" -#include "qemu/queue.h" -#include "qemu/timer.h" - -/** - * Coroutines are a mechanism for stack switching and can be used for - * cooperative userspace threading. These functions provide a simple but - * useful flavor of coroutines that is suitable for writing sequential code, - * rather than callbacks, for operations that need to give up control while - * waiting for events to complete. - * - * These functions are re-entrant and may be used outside the global mutex. - */ - -/** - * Mark a function that executes in coroutine context - * - * Functions that execute in coroutine context cannot be called directly from - * normal functions. In the future it would be nice to enable compiler or - * static checker support for catching such errors. This annotation might make - * it possible and in the meantime it serves as documentation. - * - * For example: - * - * static void coroutine_fn foo(void) { - * .... - * } - */ -#define coroutine_fn - -typedef struct Coroutine Coroutine; - -/** - * Coroutine entry point - * - * When the coroutine is entered for the first time, opaque is passed in as an - * argument. - * - * When this function returns, the coroutine is destroyed automatically and - * execution continues in the caller who last entered the coroutine. - */ -typedef void coroutine_fn CoroutineEntry(void *opaque); - -/** - * Create a new coroutine - * - * Use qemu_coroutine_enter() to actually transfer control to the coroutine. - */ -Coroutine *qemu_coroutine_create(CoroutineEntry *entry); - -/** - * Transfer control to a coroutine - * - * The opaque argument is passed as the argument to the entry point when - * entering the coroutine for the first time. It is subsequently ignored. - */ -void qemu_coroutine_enter(Coroutine *coroutine, void *opaque); - -/** - * Transfer control back to a coroutine's caller - * - * This function does not return until the coroutine is re-entered using - * qemu_coroutine_enter(). - */ -void coroutine_fn qemu_coroutine_yield(void); - -/** - * Get the currently executing coroutine - */ -Coroutine *coroutine_fn qemu_coroutine_self(void); - -/** - * Return whether or not currently inside a coroutine - * - * This can be used to write functions that work both when in coroutine context - * and when not in coroutine context. Note that such functions cannot use the - * coroutine_fn annotation since they work outside coroutine context. - */ -bool qemu_in_coroutine(void); - - - -/** - * CoQueues are a mechanism to queue coroutines in order to continue executing - * them later. They provide the fundamental primitives on which coroutine locks - * are built. - */ -typedef struct CoQueue { - QTAILQ_HEAD(, Coroutine) entries; -} CoQueue; - -/** - * Initialise a CoQueue. This must be called before any other operation is used - * on the CoQueue. - */ -void qemu_co_queue_init(CoQueue *queue); - -/** - * Adds the current coroutine to the CoQueue and transfers control to the - * caller of the coroutine. - */ -void coroutine_fn qemu_co_queue_wait(CoQueue *queue); - -/** - * Restarts the next coroutine in the CoQueue and removes it from the queue. - * - * Returns true if a coroutine was restarted, false if the queue is empty. - */ -bool coroutine_fn qemu_co_queue_next(CoQueue *queue); - -/** - * Restarts all coroutines in the CoQueue and leaves the queue empty. - */ -void coroutine_fn qemu_co_queue_restart_all(CoQueue *queue); - -/** - * Enter the next coroutine in the queue - */ -bool qemu_co_enter_next(CoQueue *queue); - -/** - * Checks if the CoQueue is empty. - */ -bool qemu_co_queue_empty(CoQueue *queue); - - -/** - * Provides a mutex that can be used to synchronise coroutines - */ -typedef struct CoMutex { - bool locked; - CoQueue queue; -} CoMutex; - -/** - * Initialises a CoMutex. This must be called before any other operation is used - * on the CoMutex. - */ -void qemu_co_mutex_init(CoMutex *mutex); - -/** - * Locks the mutex. If the lock cannot be taken immediately, control is - * transferred to the caller of the current coroutine. - */ -void coroutine_fn qemu_co_mutex_lock(CoMutex *mutex); - -/** - * Unlocks the mutex and schedules the next coroutine that was waiting for this - * lock to be run. - */ -void coroutine_fn qemu_co_mutex_unlock(CoMutex *mutex); - -typedef struct CoRwlock { - bool writer; - int reader; - CoQueue queue; -} CoRwlock; - -/** - * Initialises a CoRwlock. This must be called before any other operation - * is used on the CoRwlock - */ -void qemu_co_rwlock_init(CoRwlock *lock); - -/** - * Read locks the CoRwlock. If the lock cannot be taken immediately because - * of a parallel writer, control is transferred to the caller of the current - * coroutine. - */ -void qemu_co_rwlock_rdlock(CoRwlock *lock); - -/** - * Write Locks the mutex. If the lock cannot be taken immediately because - * of a parallel reader, control is transferred to the caller of the current - * coroutine. - */ -void qemu_co_rwlock_wrlock(CoRwlock *lock); - -/** - * Unlocks the read/write lock and schedules the next coroutine that was - * waiting for this lock to be run. - */ -void qemu_co_rwlock_unlock(CoRwlock *lock); - -/** - * Yield the coroutine for a given duration - * - * Behaves similarly to co_sleep_ns(), but the sleeping coroutine will be - * resumed when using aio_poll(). - */ -void coroutine_fn co_aio_sleep_ns(AioContext *ctx, QEMUClockType type, - int64_t ns); - -/** - * Yield until a file descriptor becomes readable - * - * Note that this function clobbers the handlers for the file descriptor. - */ -void coroutine_fn yield_until_fd_readable(int fd); - -#endif /* QEMU_COROUTINE_H */ |