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From: Richard Henderson <richard.henderson@linaro.org>
To: qemu-devel@nongnu.org
Cc: peter.maydell@linaro.org, "Thomas Huth" <thuth@redhat.com>,
	"Alex Bennée" <alex.bennee@linaro.org>
Subject: [PULL 5/8] util: Use unique type for QemuRecMutex in thread-posix.h
Date: Tue, 15 Jun 2021 18:36:26 -0700	[thread overview]
Message-ID: <20210616013629.1458790-6-richard.henderson@linaro.org> (raw)
In-Reply-To: <20210616013629.1458790-1-richard.henderson@linaro.org>

We will shortly convert lockable.h to _Generic, and we cannot
have two compatible types in the same expansion.  Wrap QemuMutex
in a struct, and unwrap in qemu-thread-posix.c.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20210614233143.1221879-6-richard.henderson@linaro.org>
---
 include/qemu/thread-posix.h | 10 ++++++++--
 util/qemu-thread-posix.c    | 12 ++++++------
 2 files changed, 14 insertions(+), 8 deletions(-)

diff --git a/include/qemu/thread-posix.h b/include/qemu/thread-posix.h
index cf8bc90468..b792e6ef37 100644
--- a/include/qemu/thread-posix.h
+++ b/include/qemu/thread-posix.h
@@ -4,8 +4,6 @@
 #include <pthread.h>
 #include <semaphore.h>
 
-typedef QemuMutex QemuRecMutex;
-
 struct QemuMutex {
     pthread_mutex_t lock;
 #ifdef CONFIG_DEBUG_MUTEX
@@ -15,6 +13,14 @@ struct QemuMutex {
     bool initialized;
 };
 
+/*
+ * QemuRecMutex cannot be a typedef of QemuMutex lest we have two
+ * compatible cases in _Generic.  See qemu/lockable.h.
+ */
+typedef struct QemuRecMutex {
+    QemuMutex m;
+} QemuRecMutex;
+
 struct QemuCond {
     pthread_cond_t cond;
     bool initialized;
diff --git a/util/qemu-thread-posix.c b/util/qemu-thread-posix.c
index d990826ed8..fd9d714038 100644
--- a/util/qemu-thread-posix.c
+++ b/util/qemu-thread-posix.c
@@ -116,32 +116,32 @@ void qemu_rec_mutex_init(QemuRecMutex *mutex)
 
     pthread_mutexattr_init(&attr);
     pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
-    err = pthread_mutex_init(&mutex->lock, &attr);
+    err = pthread_mutex_init(&mutex->m.lock, &attr);
     pthread_mutexattr_destroy(&attr);
     if (err) {
         error_exit(err, __func__);
     }
-    mutex->initialized = true;
+    mutex->m.initialized = true;
 }
 
 void qemu_rec_mutex_destroy(QemuRecMutex *mutex)
 {
-    qemu_mutex_destroy(mutex);
+    qemu_mutex_destroy(&mutex->m);
 }
 
 void qemu_rec_mutex_lock_impl(QemuRecMutex *mutex, const char *file, int line)
 {
-    qemu_mutex_lock_impl(mutex, file, line);
+    qemu_mutex_lock_impl(&mutex->m, file, line);
 }
 
 int qemu_rec_mutex_trylock_impl(QemuRecMutex *mutex, const char *file, int line)
 {
-    return qemu_mutex_trylock_impl(mutex, file, line);
+    return qemu_mutex_trylock_impl(&mutex->m, file, line);
 }
 
 void qemu_rec_mutex_unlock_impl(QemuRecMutex *mutex, const char *file, int line)
 {
-    qemu_mutex_unlock_impl(mutex, file, line);
+    qemu_mutex_unlock_impl(&mutex->m, file, line);
 }
 
 void qemu_cond_init(QemuCond *cond)
-- 
2.25.1



  parent reply	other threads:[~2021-06-16  1:47 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-16  1:36 [PULL 0/8] configure: Change to -std=gnu11 Richard Henderson
2021-06-16  1:36 ` [PULL 1/8] configure: Use -std=gnu11 Richard Henderson
2021-06-16  1:36 ` [PULL 2/8] softfloat: Use _Generic instead of QEMU_GENERIC Richard Henderson
2021-06-16  1:36 ` [PULL 3/8] util: Use real functions for thread-posix QemuRecMutex Richard Henderson
2021-06-16  1:36 ` [PULL 4/8] util: Pass file+line to qemu_rec_mutex_unlock_impl Richard Henderson
2021-06-16  1:36 ` Richard Henderson [this message]
2021-06-16  1:36 ` [PULL 6/8] include/qemu/lockable: Use _Generic instead of QEMU_GENERIC Richard Henderson
2021-06-16  1:36 ` [PULL 7/8] qemu/compiler: Remove QEMU_GENERIC Richard Henderson
2021-06-16  1:36 ` [PULL 8/8] configure: Remove probe for _Static_assert Richard Henderson
2021-06-16  1:51 ` [PULL 0/8] configure: Change to -std=gnu11 no-reply
2021-06-17 14:42 ` Peter Maydell

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