qemu

FORK: QEMU emulator
git clone https://git.neptards.moe/neptards/qemu.git
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qemu-co-timeout.c (2796B)

      1 /*
      2  * Helper functionality for distributing a fixed total amount of
      3  * an abstract resource among multiple coroutines.
      4  *
      5  * Copyright (c) 2022 Virtuozzo International GmbH
      6  *
      7  * Permission is hereby granted, free of charge, to any person obtaining a copy
      8  * of this software and associated documentation files (the "Software"), to deal
      9  * in the Software without restriction, including without limitation the rights
     10  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
     11  * copies of the Software, and to permit persons to whom the Software is
     12  * furnished to do so, subject to the following conditions:
     13  *
     14  * The above copyright notice and this permission notice shall be included in
     15  * all copies or substantial portions of the Software.
     16  *
     17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
     20  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
     21  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
     22  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
     23  * THE SOFTWARE.
     24  */
     25 
     26 #include "qemu/osdep.h"
     27 #include "qemu/coroutine.h"
     28 #include "block/aio.h"
     29 
     30 typedef struct QemuCoTimeoutState {
     31     CoroutineEntry *entry;
     32     void *opaque;
     33     QemuCoSleep sleep_state;
     34     bool marker;
     35     CleanupFunc *clean;
     36 } QemuCoTimeoutState;
     37 
     38 static void coroutine_fn qemu_co_timeout_entry(void *opaque)
     39 {
     40     QemuCoTimeoutState *s = opaque;
     41 
     42     s->entry(s->opaque);
     43 
     44     if (s->marker) {
     45         assert(!s->sleep_state.to_wake);
     46         /* .marker set by qemu_co_timeout, it have been failed */
     47         if (s->clean) {
     48             s->clean(s->opaque);
     49         }
     50         g_free(s);
     51     } else {
     52         s->marker = true;
     53         qemu_co_sleep_wake(&s->sleep_state);
     54     }
     55 }
     56 
     57 int coroutine_fn qemu_co_timeout(CoroutineEntry *entry, void *opaque,
     58                                  uint64_t timeout_ns, CleanupFunc clean)
     59 {
     60     QemuCoTimeoutState *s;
     61     Coroutine *co;
     62 
     63     if (timeout_ns == 0) {
     64         entry(opaque);
     65         return 0;
     66     }
     67 
     68     s = g_new(QemuCoTimeoutState, 1);
     69     *s = (QemuCoTimeoutState) {
     70         .entry = entry,
     71         .opaque = opaque,
     72         .clean = clean
     73     };
     74 
     75     co = qemu_coroutine_create(qemu_co_timeout_entry, s);
     76 
     77     aio_co_enter(qemu_get_current_aio_context(), co);
     78     qemu_co_sleep_ns_wakeable(&s->sleep_state, QEMU_CLOCK_REALTIME, timeout_ns);
     79 
     80     if (s->marker) {
     81         /* .marker set by qemu_co_timeout_entry, success */
     82         g_free(s);
     83         return 0;
     84     }
     85 
     86     /* Don't free s, as we can't cancel qemu_co_timeout_entry execution */
     87     s->marker = true;
     88     return -ETIMEDOUT;
     89 }