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aio: introduce AioContext, move bottom halves there

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Start introducing AioContext, which will let us remove globals from
aio.c/async.c, and introduce multiple I/O threads.

The bottom half functions now take an additional AioContext argument.
A bottom half is created with a specific AioContext that remains the
same throughout the lifetime.  qemu_bh_new is just a wrapper that
uses a global context.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2012-10-29 23:45:23 +01:00
parent 9958c351ee
commit f627aab1cc
11 changed files with 119 additions and 72 deletions
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55
main-loop.h
View file

@ -25,6 +25,8 @@
#ifndef QEMU_MAIN_LOOP_H
#define QEMU_MAIN_LOOP_H 1
#include "qemu-aio.h"
#define SIG_IPI SIGUSR1
/**
@ -163,7 +165,6 @@ void qemu_del_wait_object(HANDLE handle, WaitObjectFunc *func, void *opaque);
typedef void IOReadHandler(void *opaque, const uint8_t *buf, int size);
typedef int IOCanReadHandler(void *opaque);
typedef void IOHandler(void *opaque);
/**
* qemu_set_fd_handler2: Register a file descriptor with the main loop
@ -244,56 +245,6 @@ int qemu_set_fd_handler(int fd,
IOHandler *fd_write,
void *opaque);
typedef struct QEMUBH QEMUBH;
typedef void QEMUBHFunc(void *opaque);
/**
* qemu_bh_new: Allocate a new bottom half structure.
*
* Bottom halves are lightweight callbacks whose invocation is guaranteed
* to be wait-free, thread-safe and signal-safe. The #QEMUBH structure
* is opaque and must be allocated prior to its use.
*/
QEMUBH *qemu_bh_new(QEMUBHFunc *cb, void *opaque);
/**
* qemu_bh_schedule: Schedule a bottom half.
*
* Scheduling a bottom half interrupts the main loop and causes the
* execution of the callback that was passed to qemu_bh_new.
*
* Bottom halves that are scheduled from a bottom half handler are instantly
* invoked. This can create an infinite loop if a bottom half handler
* schedules itself.
*
* @bh: The bottom half to be scheduled.
*/
void qemu_bh_schedule(QEMUBH *bh);
/**
* qemu_bh_cancel: Cancel execution of a bottom half.
*
* Canceling execution of a bottom half undoes the effect of calls to
* qemu_bh_schedule without freeing its resources yet. While cancellation
* itself is also wait-free and thread-safe, it can of course race with the
* loop that executes bottom halves unless you are holding the iothread
* mutex. This makes it mostly useless if you are not holding the mutex.
*
* @bh: The bottom half to be canceled.
*/
void qemu_bh_cancel(QEMUBH *bh);
/**
*qemu_bh_delete: Cancel execution of a bottom half and free its resources.
*
* Deleting a bottom half frees the memory that was allocated for it by
* qemu_bh_new. It also implies canceling the bottom half if it was
* scheduled.
*
* @bh: The bottom half to be deleted.
*/
void qemu_bh_delete(QEMUBH *bh);
#ifdef CONFIG_POSIX
/**
* qemu_add_child_watch: Register a child process for reaping.
@ -349,8 +300,8 @@ void qemu_fd_register(int fd);
void qemu_iohandler_fill(int *pnfds, fd_set *readfds, fd_set *writefds, fd_set *xfds);
void qemu_iohandler_poll(fd_set *readfds, fd_set *writefds, fd_set *xfds, int rc);
QEMUBH *qemu_bh_new(QEMUBHFunc *cb, void *opaque);
void qemu_bh_schedule_idle(QEMUBH *bh);
int qemu_bh_poll(void);
void qemu_bh_update_timeout(uint32_t *timeout);
#endif