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 #ifdef CONFIG_SAFESTACK 32 /* Pointer to the unsafe stack, defined by the compiler */ 33 extern __thread void *__safestack_unsafe_stack_ptr; 34 #endif 35 36 #define COROUTINE_STACK_SIZE (1 << 20) 37 38 typedef enum { 39 COROUTINE_YIELD = 1, 40 COROUTINE_TERMINATE = 2, 41 COROUTINE_ENTER = 3, 42 } CoroutineAction; 43 44 struct Coroutine { 45 CoroutineEntry *entry; 46 void *entry_arg; 47 Coroutine *caller; 48 49 /* Only used when the coroutine has terminated. */ 50 QSLIST_ENTRY(Coroutine) pool_next; 51 52 size_t locks_held; 53 54 /* Only used when the coroutine has yielded. */ 55 AioContext *ctx; 56 57 /* Used to catch and abort on illegal co-routine entry. 58 * Will contain the name of the function that had first 59 * scheduled the coroutine. */ 60 const char *scheduled; 61 62 QSIMPLEQ_ENTRY(Coroutine) co_queue_next; 63 64 /* Coroutines that should be woken up when we yield or terminate. 65 * Only used when the coroutine is running. 66 */ 67 QSIMPLEQ_HEAD(, Coroutine) co_queue_wakeup; 68 69 QSLIST_ENTRY(Coroutine) co_scheduled_next; 70 }; 71 72 Coroutine *qemu_coroutine_new(void); 73 void qemu_coroutine_delete(Coroutine *co); 74 CoroutineAction qemu_coroutine_switch(Coroutine *from, Coroutine *to, 75 CoroutineAction action); 76 77 #endif 78