{"id":2226307,"url":"http://patchwork.ozlabs.org/api/1.2/patches/2226307/?format=json","web_url":"http://patchwork.ozlabs.org/project/gcc/patch/bmm.hhubrmqub2.gcc.gcc-TEST.redi.31.1.7@forge-stage.sourceware.org/","project":{"id":17,"url":"http://patchwork.ozlabs.org/api/1.2/projects/17/?format=json","name":"GNU Compiler Collection","link_name":"gcc","list_id":"gcc-patches.gcc.gnu.org","list_email":"gcc-patches@gcc.gnu.org","web_url":null,"scm_url":null,"webscm_url":null,"list_archive_url":"","list_archive_url_format":"","commit_url_format":""},"msgid":"","list_archive_url":null,"date":"2026-04-22T10:44:22","name":"[v1,07/16] libstdc++: Simplify futex wrapper functions for atomic wait/notify","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"1dd4b1675c36634f6f5678295be58261d6dc425f","submitter":{"id":93210,"url":"http://patchwork.ozlabs.org/api/1.2/people/93210/?format=json","name":"Jonathan Wakely via Sourceware Forge","email":"forge-bot+redi@forge-stage.sourceware.org"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/gcc/patch/bmm.hhubrmqub2.gcc.gcc-TEST.redi.31.1.7@forge-stage.sourceware.org/mbox/","series":[{"id":500987,"url":"http://patchwork.ozlabs.org/api/1.2/series/500987/?format=json","web_url":"http://patchwork.ozlabs.org/project/gcc/list/?series=500987","date":"2026-04-22T10:44:17","name":"atomic wait/notify ABI stabilization","version":1,"mbox":"http://patchwork.ozlabs.org/series/500987/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2226307/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2226307/checks/","tags":{},"related":[],"headers":{"Return-Path":"","X-Original-To":["incoming@patchwork.ozlabs.org","gcc-patches@gcc.gnu.org"],"Delivered-To":["patchwork-incoming@legolas.ozlabs.org","gcc-patches@gcc.gnu.org"],"Authentication-Results":["legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=gcc.gnu.org\n (client-ip=2620:52:6:3111::32; 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server2.sourceware.org","From":"Jonathan Wakely via Sourceware Forge\n ","Date":"Wed, 22 Apr 2026 10:44:22 +0000","Subject":"[PATCH v1 07/16] libstdc++: Simplify futex wrapper functions for\n atomic wait/notify","To":"gcc-patches mailing list ","Message-ID":"\n ","X-Mailer":"batrachomyomachia","X-Pull-Request-Organization":"gcc","X-Pull-Request-Repository":"gcc-TEST","X-Pull-Request":"https://forge.sourceware.org/gcc/gcc-TEST/pulls/31","References":"\n ","In-Reply-To":"\n ","X-Patch-URL":"\n https://forge.sourceware.org/redi/gcc/commit/5d795b478e99915b768db39d45c16cf91c9015bf","X-BeenThere":"gcc-patches@gcc.gnu.org","X-Mailman-Version":"2.1.30","Precedence":"list","List-Id":"Gcc-patches mailing list ","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Reply-To":"gcc-patches mailing list , redi@gcc.gnu.org","Errors-To":"gcc-patches-bounces~incoming=patchwork.ozlabs.org@gcc.gnu.org"},"content":"From: Jonathan Wakely \n\nlibstdc++-v3/ChangeLog:\n\n\t* include/bits/atomic_wait.h (__platform_wait): Change function\n\ttemplate to a normal function. The parameter is always\n\t__platform_wait_t* which is just int* for this implementation of\n\tthe function.\n\t(__platform_notify): Likewise.\n---\n libstdc++-v3/include/bits/atomic_wait.h | 40 ++++++++++++-------------\n 1 file changed, 20 insertions(+), 20 deletions(-)","diff":"diff --git a/libstdc++-v3/include/bits/atomic_wait.h b/libstdc++-v3/include/bits/atomic_wait.h\nindex 725ea030245d..5fd00c22565b 100644\n--- a/libstdc++-v3/include/bits/atomic_wait.h\n+++ b/libstdc++-v3/include/bits/atomic_wait.h\n@@ -108,27 +108,27 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION\n __bitset_match_any = -1\n };\n \n- template\n- void\n- __platform_wait(const _Tp* __addr, __platform_wait_t __val) noexcept\n- {\n-\tauto __e = syscall (SYS_futex, static_cast(__addr),\n-\t\t\t static_cast(__futex_wait_flags::__wait_private),\n-\t\t\t __val, nullptr);\n-\tif (!__e || errno == EAGAIN)\n-\t return;\n-\tif (errno != EINTR)\n-\t __throw_system_error(errno);\n- }\n+ // If the futex *__addr is equal to __val, wait on the futex until woken.\n+ inline void\n+ __platform_wait(const int* __addr, int __val) noexcept\n+ {\n+ auto __e = syscall (SYS_futex, __addr,\n+\t\t\t static_cast(__futex_wait_flags::__wait_private),\n+\t\t\t __val, nullptr);\n+ if (!__e || errno == EAGAIN)\n+\treturn;\n+ if (errno != EINTR)\n+\t__throw_system_error(errno);\n+ }\n \n- template\n- void\n- __platform_notify(const _Tp* __addr, bool __all) noexcept\n- {\n-\tsyscall (SYS_futex, static_cast(__addr),\n-\t\t static_cast(__futex_wait_flags::__wake_private),\n-\t\t __all ? INT_MAX : 1);\n- }\n+ // Wake threads waiting on the futex *__addr.\n+ inline void\n+ __platform_notify(const int* __addr, bool __all) noexcept\n+ {\n+ syscall (SYS_futex, __addr,\n+\t static_cast(__futex_wait_flags::__wake_private),\n+\t __all ? INT_MAX : 1);\n+ }\n #endif\n \n inline void\n","prefixes":["v1","07/16"]}