{"id":2075170,"url":"http://patchwork.ozlabs.org/api/patches/2075170/?format=json","web_url":"http://patchwork.ozlabs.org/project/qemu-devel/patch/82afa4d287a16f89fa59f08cba14fb06e017ea83.1745295397.git.ktokunaga.mail@gmail.com/","project":{"id":14,"url":"http://patchwork.ozlabs.org/api/projects/14/?format=json","name":"QEMU Development","link_name":"qemu-devel","list_id":"qemu-devel.nongnu.org","list_email":"qemu-devel@nongnu.org","web_url":"","scm_url":"","webscm_url":"","list_archive_url":"","list_archive_url_format":"","commit_url_format":""},"msgid":"<82afa4d287a16f89fa59f08cba14fb06e017ea83.1745295397.git.ktokunaga.mail@gmail.com>","list_archive_url":null,"date":"2025-04-22T05:27:21","name":"[v2,17/20] util: Add coroutine backend for emscripten","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"b103f50a73c7da967fe8c20ad9612e8fd465d941","submitter":{"id":90637,"url":"http://patchwork.ozlabs.org/api/people/90637/?format=json","name":"Kohei Tokunaga","email":"ktokunaga.mail@gmail.com"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/qemu-devel/patch/82afa4d287a16f89fa59f08cba14fb06e017ea83.1745295397.git.ktokunaga.mail@gmail.com/mbox/","series":[{"id":453631,"url":"http://patchwork.ozlabs.org/api/series/453631/?format=json","web_url":"http://patchwork.ozlabs.org/project/qemu-devel/list/?series=453631","date":"2025-04-22T05:27:04","name":"Enable QEMU TCI to run 32bit guests on browsers","version":2,"mbox":"http://patchwork.ozlabs.org/series/453631/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2075170/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2075170/checks/","tags":{},"related":[],"headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20230601 header.b=hELil73m;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; 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helo=mail-pl1-x629.google.com","X-Spam_score_int":"-20","X-Spam_score":"-2.1","X-Spam_bar":"--","X-Spam_report":"(-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1,\n DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001,\n RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001,\n SPF_PASS=-0.001 autolearn=ham autolearn_force=no","X-Spam_action":"no action","X-BeenThere":"qemu-devel@nongnu.org","X-Mailman-Version":"2.1.29","Precedence":"list","List-Id":"","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Errors-To":"qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org","Sender":"qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org"},"content":"Emscripten does not support couroutine methods currently used by QEMU but\nprovides a coroutine implementation called \"fiber\". This commit introduces a\ncoroutine backend using fiber. Note that fiber does not support submitting\ncoroutines to other threads.\n\nSigned-off-by: Kohei Tokunaga \n---\n MAINTAINERS | 1 +\n util/coroutine-wasm.c | 127 ++++++++++++++++++++++++++++++++++++++++++\n 2 files changed, 128 insertions(+)\n create mode 100644 util/coroutine-wasm.c\n\nV2:\n- Split the MAINTAINERS file change that adds coroutine-wasm.c from the\n previous 19th patch into this commit.","diff":"diff --git a/MAINTAINERS b/MAINTAINERS\nindex c7a20ac8d7..72319f804e 100644\n--- a/MAINTAINERS\n+++ b/MAINTAINERS\n@@ -624,6 +624,7 @@ M: Kohei Tokunaga \n S: Maintained\n F: include/system/os-wasm.h\n F: os-wasm.c\n+F: util/coroutine-wasm.c\n \n Alpha Machines\n --------------\ndiff --git a/util/coroutine-wasm.c b/util/coroutine-wasm.c\nnew file mode 100644\nindex 0000000000..cb1ec92509\n--- /dev/null\n+++ b/util/coroutine-wasm.c\n@@ -0,0 +1,127 @@\n+/*\n+ * emscripten fiber coroutine initialization code\n+ * based on coroutine-ucontext.c\n+ *\n+ * Copyright (C) 2006 Anthony Liguori \n+ * Copyright (C) 2011 Kevin Wolf \n+ *\n+ * This library is free software; you can redistribute it and/or\n+ * modify it under the terms of the GNU Lesser General Public\n+ * License as published by the Free Software Foundation; either\n+ * version 2.0 of the License, or (at your option) any later version.\n+ *\n+ * This library is distributed in the hope that it will be useful,\n+ * but WITHOUT ANY WARRANTY; without even the implied warranty of\n+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU\n+ * Lesser General Public License for more details.\n+ *\n+ * You should have received a copy of the GNU Lesser General Public\n+ * License along with this library; if not, see .\n+ */\n+\n+#include \"qemu/osdep.h\"\n+#include \"qemu/coroutine_int.h\"\n+#include \"qemu/coroutine-tls.h\"\n+\n+#include \n+\n+typedef struct {\n+ Coroutine base;\n+ void *stack;\n+ size_t stack_size;\n+\n+ void *asyncify_stack;\n+ size_t asyncify_stack_size;\n+\n+ CoroutineAction action;\n+\n+ emscripten_fiber_t fiber;\n+} CoroutineEmscripten;\n+\n+/**\n+ * Per-thread coroutine bookkeeping\n+ */\n+QEMU_DEFINE_STATIC_CO_TLS(Coroutine *, current);\n+QEMU_DEFINE_STATIC_CO_TLS(CoroutineEmscripten *, leader);\n+size_t leader_asyncify_stack_size = COROUTINE_STACK_SIZE;\n+\n+static void coroutine_trampoline(void *co_)\n+{\n+ Coroutine *co = co_;\n+\n+ while (true) {\n+ co->entry(co->entry_arg);\n+ qemu_coroutine_switch(co, co->caller, COROUTINE_TERMINATE);\n+ }\n+}\n+\n+Coroutine *qemu_coroutine_new(void)\n+{\n+ CoroutineEmscripten *co;\n+\n+ co = g_malloc0(sizeof(*co));\n+\n+ co->stack_size = COROUTINE_STACK_SIZE;\n+ co->stack = qemu_alloc_stack(&co->stack_size);\n+\n+ co->asyncify_stack_size = COROUTINE_STACK_SIZE;\n+ co->asyncify_stack = g_malloc0(co->asyncify_stack_size);\n+ emscripten_fiber_init(&co->fiber, coroutine_trampoline, &co->base,\n+ co->stack, co->stack_size, co->asyncify_stack,\n+ co->asyncify_stack_size);\n+\n+ return &co->base;\n+}\n+\n+void qemu_coroutine_delete(Coroutine *co_)\n+{\n+ CoroutineEmscripten *co = DO_UPCAST(CoroutineEmscripten, base, co_);\n+\n+ qemu_free_stack(co->stack, co->stack_size);\n+ g_free(co->asyncify_stack);\n+ g_free(co);\n+}\n+\n+CoroutineAction qemu_coroutine_switch(Coroutine *from_, Coroutine *to_,\n+ CoroutineAction action)\n+{\n+ CoroutineEmscripten *from = DO_UPCAST(CoroutineEmscripten, base, from_);\n+ CoroutineEmscripten *to = DO_UPCAST(CoroutineEmscripten, base, to_);\n+\n+ set_current(to_);\n+ to->action = action;\n+ emscripten_fiber_swap(&from->fiber, &to->fiber);\n+ return from->action;\n+}\n+\n+Coroutine *qemu_coroutine_self(void)\n+{\n+ Coroutine *self = get_current();\n+\n+ if (!self) {\n+ CoroutineEmscripten *leaderp = get_leader();\n+ if (!leaderp) {\n+ leaderp = g_malloc0(sizeof(*leaderp));\n+ leaderp->asyncify_stack = g_malloc0(leader_asyncify_stack_size);\n+ leaderp->asyncify_stack_size = leader_asyncify_stack_size;\n+ emscripten_fiber_init_from_current_context(\n+ &leaderp->fiber,\n+ leaderp->asyncify_stack,\n+ leaderp->asyncify_stack_size);\n+ leaderp->stack = leaderp->fiber.stack_limit;\n+ leaderp->stack_size =\n+ leaderp->fiber.stack_base - leaderp->fiber.stack_limit;\n+ set_leader(leaderp);\n+ }\n+ self = &leaderp->base;\n+ set_current(self);\n+ }\n+ return self;\n+}\n+\n+bool qemu_in_coroutine(void)\n+{\n+ Coroutine *self = get_current();\n+\n+ return self && self->caller;\n+}\n","prefixes":["v2","17/20"]}