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[PATCH v2 1/7] qemu/main-loop: Introduce QEMU_IOTHREAD_LOCK_GUARD, WITH_
From: |
Richard Henderson |
Subject: |
[PATCH v2 1/7] qemu/main-loop: Introduce QEMU_IOTHREAD_LOCK_GUARD, WITH_QEMU_IOTHREAD_LOCK |
Date: |
Tue, 22 Nov 2022 12:57:33 -0800 |
Create a couple of wrappers for locking/unlocking the iothread lock.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
include/qemu/main-loop.h | 39 +++++++++++++++++++++++++++++++++++++++
1 file changed, 39 insertions(+)
diff --git a/include/qemu/main-loop.h b/include/qemu/main-loop.h
index 3c9a9a982d..73c60a9af4 100644
--- a/include/qemu/main-loop.h
+++ b/include/qemu/main-loop.h
@@ -343,6 +343,45 @@ void qemu_mutex_lock_iothread_impl(const char *file, int
line);
*/
void qemu_mutex_unlock_iothread(void);
+/**
+ * QEMU_IOTHREAD_LOCK_GUARD
+ * WITH_QEMU_IOTHREAD_LOCK
+ *
+ * Wrap a block of code in a conditional qemu_mutex_{lock,unlock}_iothread.
+ */
+typedef struct IOThreadLockAuto {
+ bool locked;
+ bool iterate;
+} IOThreadLockAuto;
+
+static inline IOThreadLockAuto qemu_iothread_auto_lock(const char *file,
+ int line)
+{
+ bool need = !qemu_mutex_iothread_locked();
+ if (need) {
+ qemu_mutex_lock_iothread_impl(file, line);
+ }
+ return (IOThreadLockAuto){ .locked = need, .iterate = true };
+}
+
+static inline void qemu_iothread_auto_unlock(IOThreadLockAuto *l)
+{
+ if (l->locked) {
+ qemu_mutex_unlock_iothread();
+ }
+}
+
+G_DEFINE_AUTO_CLEANUP_CLEAR_FUNC(IOThreadLockAuto, qemu_iothread_auto_unlock)
+
+#define QEMU_IOTHREAD_LOCK_GUARD() \
+ g_auto(IOThreadLockAuto) _iothread_lock_auto \
+ = qemu_iothread_auto_lock(__FILE__, __LINE__) \
+
+#define WITH_QEMU_IOTHREAD_LOCK() \
+ for (QEMU_IOTHREAD_LOCK_GUARD(); \
+ _iothread_lock_auto.iterate; \
+ _iothread_lock_auto.iterate = false)
+
/*
* qemu_cond_wait_iothread: Wait on condition for the main loop mutex
*
--
2.34.1
- [PATCH v2 0/7] main-loop: Introduce QEMU_IOTHREAD_LOCK_GUARD, Richard Henderson, 2022/11/22
- [PATCH v2 1/7] qemu/main-loop: Introduce QEMU_IOTHREAD_LOCK_GUARD, WITH_QEMU_IOTHREAD_LOCK,
Richard Henderson <=
- [PATCH v2 2/7] hw/mips: Use WITH_QEMU_IOTHREAD_LOCK in cpu_mips_irq_request, Richard Henderson, 2022/11/22
- [PATCH v2 3/7] target/ppc: Use QEMU_IOTHREAD_LOCK_GUARD in ppc_maybe_interrupt, Richard Henderson, 2022/11/22
- [PATCH v2 6/7] target/riscv: Use QEMU_IOTHREAD_LOCK_GUARD in riscv_cpu_update_mip, Richard Henderson, 2022/11/22
- [PATCH v2 5/7] hw/ppc: Use QEMU_IOTHREAD_LOCK_GUARD in ppc_set_irq, Richard Henderson, 2022/11/22
- [PATCH v2 7/7] accel/tcg: Use WITH_QEMU_IOTHREAD_LOCK in io_readx/io_writex, Richard Henderson, 2022/11/22
- [PATCH v2 4/7] target/ppc: Use QEMU_IOTHREAD_LOCK_GUARD in cpu_interrupt_exittb, Richard Henderson, 2022/11/22