[Qemu-devel] [PATCH 05/10] include: add spinlock wrapper

["Emilio G. Cota" <cota@braap.org>]

Wrap pthread_spin on POSIX, or QemuMutex on Windows.

AFAIK there are is no off-the-shelf spinlock implementation for
Windows, so we'll just use QemuMutex.

Signed-off-by: Emilio G. Cota <cota@braap.org>
---
 include/qemu/spinlock-posix.h | 60 +++++++++++++++++++++++++++++++++++++++++++
 include/qemu/spinlock-win32.h | 33 ++++++++++++++++++++++++
 include/qemu/spinlock.h       | 10 ++++++++
 3 files changed, 103 insertions(+)
 create mode 100644 include/qemu/spinlock-posix.h
 create mode 100644 include/qemu/spinlock-win32.h
 create mode 100644 include/qemu/spinlock.h

diff --git a/include/qemu/spinlock-posix.h b/include/qemu/spinlock-posix.h
new file mode 100644
index 0000000..51c2c08
--- /dev/null
+++ b/include/qemu/spinlock-posix.h
@@ -0,0 +1,60 @@
+#ifndef QEMU_SPINLOCK_POSIX_H
+#define QEMU_SPINLOCK_POSIX_H
+
+#include <qemu/thread.h>
+#include <qemu/osdep.h>
+
+typedef pthread_spinlock_t QemuSpinLock;
+
+static inline void qemu_spinlock_error_exit(int err, const char *msg)
+{
+    fprintf(stderr, "qemu: %s: %s\n", msg, strerror(err));
+    abort();
+}
+
+static inline void qemu_spinlock_init(QemuSpinLock *lock)
+{
+    int rc;
+
+    rc = pthread_spin_init(lock, PTHREAD_PROCESS_SHARED);
+    if (unlikely(rc)) {
+        qemu_spinlock_error_exit(rc, __func__);
+    }
+}
+
+static inline void qemu_spinlock_destroy(QemuSpinLock *lock)
+{
+    int rc;
+
+    rc = pthread_spin_destroy(lock);
+    if (unlikely(rc)) {
+        qemu_spinlock_error_exit(rc, __func__);
+    }
+}
+
+static inline void qemu_spinlock_lock(QemuSpinLock *lock)
+{
+    int rc;
+
+    rc = pthread_spin_lock(lock);
+    if (unlikely(rc)) {
+        qemu_spinlock_error_exit(rc, __func__);
+    }
+}
+
+static inline int qemu_spinlock_trylock(QemuSpinLock *lock)
+{
+    return pthread_spin_trylock(lock);
+}
+
+static inline void qemu_spinlock_unlock(QemuSpinLock *lock)
+{
+    int rc;
+
+    rc = pthread_spin_unlock(lock);
+    if (unlikely(rc)) {
+        qemu_spinlock_error_exit(rc, __func__);
+    }
+}
+
+#endif /* QEMU_SPINLOCK_POSIX_H */
diff --git a/include/qemu/spinlock-win32.h b/include/qemu/spinlock-win32.h
new file mode 100644
index 0000000..5a105fb
--- /dev/null
+++ b/include/qemu/spinlock-win32.h
@@ -0,0 +1,33 @@
+#ifndef QEMU_SPINLOCK_WIN32_H
+#define QEMU_SPINLOCK_WIN32_H
+
+#include <qemu/thread.h>
+
+typedef QemuMutex QemuSpinLock;
+
+static inline void qemu_spinlock_init(QemuSpinLock *lock)
+{
+    qemu_mutex_init(lock);
+}
+
+static inline void qemu_spinlock_destroy(QemuSpinLock *lock)
+{
+    qemu_mutex_destroy(lock);
+}
+
+static inline void qemu_spinlock_lock(QemuSpinLock *lock)
+{
+    qemu_mutex_lock(lock);
+}
+
+static inline int qemu_spinlock_trylock(QemuSpinLock *lock)
+{
+    return qemu_mutex_trylock(lock);
+}
+
+static inline void qemu_spinlock_unlock(QemuSpinLock *lock)
+{
+    qemu_mutex_unlock(lock);
+}
+
+#endif /* QEMU_SPINLOCK_WIN32_H */
diff --git a/include/qemu/spinlock.h b/include/qemu/spinlock.h
new file mode 100644
index 0000000..001b55e
--- /dev/null
+++ b/include/qemu/spinlock.h
@@ -0,0 +1,10 @@
+#ifndef QEMU_SPINLOCK_H
+#define QEMU_SPINLOCK_H
+
+#ifdef _WIN32
+#include "spinlock-win32.h"
+#else
+#include "spinlock-posix.h"
+#endif
+
+#endif /* QEMU_SPINLOCK_H */
-- 
2.5.0