On 05/04/2016 07:30, Emilio G. Cota wrote: > 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.
It's much simpler to use a simple test-and-set spinlock. GitHub is down, but this should be the link http://github.com/bonzini/qemu/commit/e1361634 (it's in my mttcg branch). Paolo > Signed-off-by: Emilio G. Cota <c...@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 */ >