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git.proxmox.com Git - mirror_qemu.git/blob - async.c
4 * Copyright (c) 2003-2008 Fabrice Bellard
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
25 #include "qemu-common.h"
27 /***********************************************************/
28 /* bottom halves (can be seen as timers which expire ASAP) */
39 static QEMUBH
*first_bh
= NULL
;
41 QEMUBH
*qemu_bh_new(QEMUBHFunc
*cb
, void *opaque
)
44 bh
= qemu_mallocz(sizeof(QEMUBH
));
52 int qemu_bh_poll(void)
58 for (bh
= first_bh
; bh
; bh
= bh
->next
) {
59 if (!bh
->deleted
&& bh
->scheduled
) {
68 /* remove deleted bhs */
82 void qemu_bh_schedule_idle(QEMUBH
*bh
)
90 void qemu_bh_schedule(QEMUBH
*bh
)
96 /* stop the currently executing CPU to execute the BH ASAP */
100 void qemu_bh_cancel(QEMUBH
*bh
)
105 void qemu_bh_delete(QEMUBH
*bh
)
111 void qemu_bh_update_timeout(int *timeout
)
115 for (bh
= first_bh
; bh
; bh
= bh
->next
) {
116 if (!bh
->deleted
&& bh
->scheduled
) {
118 /* idle bottom halves will be polled at least
120 *timeout
= MIN(10, *timeout
);
122 /* non-idle bottom halves will be executed