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Sun, 25 May 2025 22:29:48 -0700 (PDT) Received: from localhost ([157.82.128.1]) by smtp.gmail.com with UTF8SMTPSA id 98e67ed59e1d1-30f364907d4sm11457853a91.24.2025.05.25.22.29.46 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 25 May 2025 22:29:48 -0700 (PDT) From: Akihiko Odaki Date: Mon, 26 May 2025 14:29:17 +0900 Subject: [PATCH v4 07/11] qemu-thread: Use futex if available for QemuLockCnt MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20250526-event-v4-7-5b784cc8e1de@daynix.com> References: <20250526-event-v4-0-5b784cc8e1de@daynix.com> In-Reply-To: <20250526-event-v4-0-5b784cc8e1de@daynix.com> To: Paolo Bonzini , Stefan Weil , Peter Xu , Fabiano Rosas , Hailiang Zhang Cc: Phil Dennis-Jordan , qemu-devel@nongnu.org, devel@daynix.com, =?utf-8?q?Marc-Andr=C3=A9_Lureau?= , =?utf-8?q?Daniel_P=2E_Berrang=C3=A9?= , =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= , Akihiko Odaki X-Mailer: b4 0.15-dev-edae6 Received-SPF: pass client-ip=2607:f8b0:4864:20::632; envelope-from=akihiko.odaki@daynix.com; helo=mail-pl1-x632.google.com X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-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 This unlocks the futex-based implementation of QemuLockCnt to Windows. Signed-off-by: Akihiko Odaki --- include/qemu/lockcnt.h | 2 +- util/lockcnt.c | 7 ++++--- 2 files changed, 5 insertions(+), 4 deletions(-) diff --git a/include/qemu/lockcnt.h b/include/qemu/lockcnt.h index f4b62a3f7011..5a2800e3f182 100644 --- a/include/qemu/lockcnt.h +++ b/include/qemu/lockcnt.h @@ -17,7 +17,7 @@ typedef struct QemuLockCnt QemuLockCnt; struct QemuLockCnt { -#ifndef CONFIG_LINUX +#ifndef HAVE_FUTEX QemuMutex mutex; #endif unsigned count; diff --git a/util/lockcnt.c b/util/lockcnt.c index ca27d8e61a5c..92c9f8ceca88 100644 --- a/util/lockcnt.c +++ b/util/lockcnt.c @@ -12,10 +12,11 @@ #include "qemu/atomic.h" #include "trace.h" -#ifdef CONFIG_LINUX -#include "qemu/futex.h" +#ifdef HAVE_FUTEX -/* On Linux, bits 0-1 are a futex-based lock, bits 2-31 are the counter. +/* + * When futex is available, bits 0-1 are a futex-based lock, bits 2-31 are the + * counter. * For the mutex algorithm see Ulrich Drepper's "Futexes Are Tricky" (ok, * this is not the most relaxing citation I could make...). It is similar * to mutex2 in the paper. -- 2.49.0