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m[mutex] Remove busyloop mutex implemenation 

Don't know why I ever added this. :)
This commit is contained in:
Behdad Esfahbod 2020-06-29 01:40:30 -07:00
parent 47f01c0726
commit 711c241f6c
3 changed files with 0 additions and 26 deletions
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5
configure.ac
View File

@ -449,11 +449,6 @@ if $hb_cv_have_solaris_atomic_ops; then
AC_DEFINE(HAVE_SOLARIS_ATOMIC_OPS, 1, [Have Solaris __machine_*_barrier and atomic_* operations])
fi
if test "$os_win32" = no && ! $have_pthread; then
AC_CHECK_HEADERS(sched.h)
AC_SEARCH_LIBS(sched_yield,rt,AC_DEFINE(HAVE_SCHED_YIELD, 1, [Have sched_yield]))
fi
dnl ===========================================================================
AC_CONFIG_FILES([

3
meson.build
View File

@ -285,9 +285,6 @@ if host_machine.system() != 'windows'
if thread_dep.found()
conf.set('HAVE_PTHREAD', 1)
else
check_headers += ['sched.h']
check_funcs += ['sched_yield', {'link_with': 'rt'}]
endif
endif

18
src/hb-mutex.hh
View File

@ -73,24 +73,6 @@ typedef CRITICAL_SECTION hb_mutex_impl_t;
#define hb_mutex_impl_finish(M) DeleteCriticalSection (M)
#elif !defined(HB_NO_MT) && defined(HAVE_INTEL_ATOMIC_PRIMITIVES)
#if defined(HAVE_SCHED_H) && defined(HAVE_SCHED_YIELD)
# include <sched.h>
# define HB_SCHED_YIELD() sched_yield ()
#else
# define HB_SCHED_YIELD() HB_STMT_START {} HB_STMT_END
#endif
/* This actually is not a totally awful implementation. */
typedef volatile int hb_mutex_impl_t;
#define HB_MUTEX_IMPL_INIT 0
#define hb_mutex_impl_init(M) *(M) = 0
#define hb_mutex_impl_lock(M) HB_STMT_START { while (__sync_lock_test_and_set((M), 1)) HB_SCHED_YIELD (); } HB_STMT_END
#define hb_mutex_impl_unlock(M) __sync_lock_release (M)
#define hb_mutex_impl_finish(M) HB_STMT_START {} HB_STMT_END
#elif defined(HB_NO_MT)
typedef int hb_mutex_impl_t;