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([2602:47:d48a:1201:90b2:345f:bf0a:c412]) by smtp.gmail.com with ESMTPSA id a27-20020aa794bb000000b0056e8eb09d57sm2672305pfl.63.2022.11.18.01.19.01 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 18 Nov 2022 01:19:01 -0800 (PST) From: Richard Henderson To: qemu-devel@nongnu.org Cc: Paolo Bonzini Subject: [PATCH for-8.0 1/7] qemu/main-loop: Introduce QEMU_IOTHREAD_LOCK_GUARD Date: Fri, 18 Nov 2022 01:18:52 -0800 Message-Id: <20221118091858.242569-2-richard.henderson@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20221118091858.242569-1-richard.henderson@linaro.org> References: <20221118091858.242569-1-richard.henderson@linaro.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=2607:f8b0:4864:20::52f; envelope-from=richard.henderson@linaro.org; helo=mail-pg1-x52f.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, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, 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: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Create a wrapper for locking/unlocking the iothread lock. Signed-off-by: Richard Henderson --- Cc: Paolo Bonzini (maintainer:Main loop) --- include/qemu/main-loop.h | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) diff --git a/include/qemu/main-loop.h b/include/qemu/main-loop.h index 3c9a9a982d..c25f390696 100644 --- a/include/qemu/main-loop.h +++ b/include/qemu/main-loop.h @@ -343,6 +343,35 @@ void qemu_mutex_lock_iothread_impl(const char *file, int line); */ void qemu_mutex_unlock_iothread(void); +/** + * QEMU_IOTHREAD_LOCK_GUARD + * + * Wrap a block of code in a conditional qemu_mutex_{lock,unlock}_iothread. + */ +typedef struct IOThreadLockAuto IOThreadLockAuto; + +static inline IOThreadLockAuto *qemu_iothread_auto_lock(const char *file, + int line) +{ + if (qemu_mutex_iothread_locked()) { + return NULL; + } + qemu_mutex_lock_iothread_impl(file, line); + /* Anything non-NULL causes the cleanup function to be called */ + return (IOThreadLockAuto *)(uintptr_t)1; +} + +static inline void qemu_iothread_auto_unlock(IOThreadLockAuto *l) +{ + qemu_mutex_unlock_iothread(); +} + +G_DEFINE_AUTOPTR_CLEANUP_FUNC(IOThreadLockAuto, qemu_iothread_auto_unlock) + +#define QEMU_IOTHREAD_LOCK_GUARD() \ + g_autoptr(IOThreadLockAuto) _iothread_lock_auto __attribute__((unused)) \ + = qemu_iothread_auto_lock(__FILE__, __LINE__) + /* * qemu_cond_wait_iothread: Wait on condition for the main loop mutex * -- 2.34.1