1 /* 2 * Coroutine internals 3 * 4 * Copyright (c) 2011 Kevin Wolf <kwolf@redhat.com> 5 * 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: 12 * 13 * The above copyright notice and this permission notice shall be included in 14 * all copies or substantial portions of the Software. 15 * 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 22 * THE SOFTWARE. 23 */ 24 25 #ifndef QEMU_COROUTINE_INT_H 26 #define QEMU_COROUTINE_INT_H 27 28 #include "qemu/queue.h" 29 #include "qemu/coroutine.h" 30 31 #define COROUTINE_STACK_SIZE (1 << 20) 32 33 typedef enum { 34 COROUTINE_YIELD = 1, 35 COROUTINE_TERMINATE = 2, 36 COROUTINE_ENTER = 3, 37 } CoroutineAction; 38 39 struct Coroutine { 40 CoroutineEntry *entry; 41 void *entry_arg; 42 Coroutine *caller; 43 44 /* Only used when the coroutine has terminated. */ 45 QSLIST_ENTRY(Coroutine) pool_next; 46 47 size_t locks_held; 48 49 /* Only used when the coroutine has yielded. */ 50 AioContext *ctx; 51 52 /* Used to catch and abort on illegal co-routine entry. 53 * Will contain the name of the function that had first 54 * scheduled the coroutine. */ 55 const char *scheduled; 56 57 QSIMPLEQ_ENTRY(Coroutine) co_queue_next; 58 59 /* Coroutines that should be woken up when we yield or terminate. 60 * Only used when the coroutine is running. 61 */ 62 QSIMPLEQ_HEAD(, Coroutine) co_queue_wakeup; 63 64 QSLIST_ENTRY(Coroutine) co_scheduled_next; 65 }; 66 67 Coroutine *qemu_coroutine_new(void); 68 void qemu_coroutine_delete(Coroutine *co); 69 CoroutineAction qemu_coroutine_switch(Coroutine *from, Coroutine *to, 70 CoroutineAction action); 71 72 #endif 73