+/*
+ * Copyright (c) 2008-2013 Apple Inc. All rights reserved.
+ *
+ * @APPLE_APACHE_LICENSE_HEADER_START@
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * @APPLE_APACHE_LICENSE_HEADER_END@
+ */
+
+/*
+ * IMPORTANT: This header file describes INTERNAL interfaces to libplatform
+ * which are subject to change in future releases of Mac OS X. Any applications
+ * relying on these interfaces WILL break.
+ */
+
+#ifndef __OS_ATOMIC__
+#define __OS_ATOMIC__
+
+// generate error during codegen
+#define _os_atomic_unimplemented() \
+ ({ __asm__(".err unimplemented"); })
+
+#pragma mark -
+#pragma mark memory_order
+
+typedef enum _os_atomic_memory_order
+{
+ _os_atomic_memory_order_relaxed,
+ _os_atomic_memory_order_consume,
+ _os_atomic_memory_order_acquire,
+ _os_atomic_memory_order_release,
+ _os_atomic_memory_order_acq_rel,
+ _os_atomic_memory_order_seq_cst,
+} _os_atomic_memory_order;
+
+#if !OS_ATOMIC_UP
+
+#define os_atomic_memory_order_relaxed \
+ _os_atomic_memory_order_relaxed
+#define os_atomic_memory_order_acquire \
+ _os_atomic_memory_order_acquire
+#define os_atomic_memory_order_release \
+ _os_atomic_memory_order_release
+#define os_atomic_memory_order_acq_rel \
+ _os_atomic_memory_order_acq_rel
+#define os_atomic_memory_order_seq_cst \
+ _os_atomic_memory_order_seq_cst
+
+#else // OS_ATOMIC_UP
+
+#define os_atomic_memory_order_relaxed \
+ _os_atomic_memory_order_relaxed
+#define os_atomic_memory_order_acquire \
+ _os_atomic_memory_order_relaxed
+#define os_atomic_memory_order_release \
+ _os_atomic_memory_order_relaxed
+#define os_atomic_memory_order_acq_rel \
+ _os_atomic_memory_order_relaxed
+#define os_atomic_memory_order_seq_cst \
+ _os_atomic_memory_order_relaxed
+
+#endif // OS_ATOMIC_UP
+
+#if __has_extension(c_generic_selections)
+#define _os_atomic_basetypeof(p) \
+ typeof(*_Generic((p), \
+ int*: (int*)(p), \
+ volatile int*: (int*)(p), \
+ unsigned int*: (unsigned int*)(p), \
+ volatile unsigned int*: (unsigned int*)(p), \
+ long*: (long*)(p), \
+ volatile long*: (long*)(p), \
+ unsigned long*: (unsigned long*)(p), \
+ volatile unsigned long*: (unsigned long*)(p), \
+ long long*: (long long*)(p), \
+ volatile long long*: (long long*)(p), \
+ unsigned long long*: (unsigned long long*)(p), \
+ volatile unsigned long long*: (unsigned long long*)(p), \
+ default: (void**)(p)))
+#endif
+
+#if __has_extension(c_atomic) && __has_extension(c_generic_selections)
+#pragma mark -
+#pragma mark c11
+
+#define _os_atomic_c11_atomic(p) \
+ _Generic((p), \
+ int*: (_Atomic(int)*)(p), \
+ volatile int*: (volatile _Atomic(int)*)(p), \
+ unsigned int*: (_Atomic(unsigned int)*)(p), \
+ volatile unsigned int*: (volatile _Atomic(unsigned int)*)(p), \
+ long*: (_Atomic(long)*)(p), \
+ volatile long*: (volatile _Atomic(long)*)(p), \
+ unsigned long*: (_Atomic(unsigned long)*)(p), \
+ volatile unsigned long*: (volatile _Atomic(unsigned long)*)(p), \
+ long long*: (_Atomic(long long)*)(p), \
+ volatile long long*: (volatile _Atomic(long long)*)(p), \
+ unsigned long long*: (_Atomic(unsigned long long)*)(p), \
+ volatile unsigned long long*: \
+ (volatile _Atomic(unsigned long long)*)(p), \
+ default: (volatile _Atomic(void*)*)(p))
+
+#define _os_atomic_barrier(m) \
+ ({ __c11_atomic_thread_fence(os_atomic_memory_order_##m); })
+#define os_atomic_load(p, m) \
+ ({ _os_atomic_basetypeof(p) _r = \
+ __c11_atomic_load(_os_atomic_c11_atomic(p), \
+ os_atomic_memory_order_##m); (typeof(*(p)))_r; })
+#define os_atomic_store(p, v, m) \
+ ({ _os_atomic_basetypeof(p) _v = (v); \
+ __c11_atomic_store(_os_atomic_c11_atomic(p), _v, \
+ os_atomic_memory_order_##m); })
+#define os_atomic_xchg(p, v, m) \
+ ({ _os_atomic_basetypeof(p) _v = (v), _r = \
+ __c11_atomic_exchange(_os_atomic_c11_atomic(p), _v, \
+ os_atomic_memory_order_##m); (typeof(*(p)))_r; })
+#define os_atomic_cmpxchg(p, e, v, m) \
+ ({ _os_atomic_basetypeof(p) _v = (v), _r = (e); \
+ __c11_atomic_compare_exchange_strong(_os_atomic_c11_atomic(p), \
+ &_r, _v, os_atomic_memory_order_##m, \
+ os_atomic_memory_order_relaxed); })
+#define os_atomic_cmpxchgv(p, e, v, g, m) \
+ ({ _os_atomic_basetypeof(p) _v = (v), _r = (e); _Bool _b = \
+ __c11_atomic_compare_exchange_strong(_os_atomic_c11_atomic(p), \
+ &_r, _v, os_atomic_memory_order_##m, \
+ os_atomic_memory_order_relaxed); *(g) = (typeof(*(p)))_r; _b; })
+#define os_atomic_cmpxchgvw(p, e, v, g, m) \
+ ({ _os_atomic_basetypeof(p) _v = (v), _r = (e); _Bool _b = \
+ __c11_atomic_compare_exchange_weak(_os_atomic_c11_atomic(p), \
+ &_r, _v, os_atomic_memory_order_##m, \
+ os_atomic_memory_order_relaxed); *(g) = (typeof(*(p)))_r; _b; })
+#define _os_atomic_c11_op(p, v, m, o, op) \
+ ({ _os_atomic_basetypeof(p) _v = (v), _r = \
+ __c11_atomic_fetch_##o(_os_atomic_c11_atomic(p), _v, \
+ os_atomic_memory_order_##m); (typeof(*(p)))(_r op _v); })
+#define _os_atomic_c11_op_orig(p, v, m, o, op) \
+ ({ _os_atomic_basetypeof(p) _v = (v), _r = \
+ __c11_atomic_fetch_##o(_os_atomic_c11_atomic(p), _v, \
+ os_atomic_memory_order_##m); (typeof(*(p)))_r; })
+
+#define os_atomic_add(p, v, m) \
+ _os_atomic_c11_op((p), (v), m, add, +)
+#define os_atomic_add_orig(p, v, m) \
+ _os_atomic_c11_op_orig((p), (v), m, add, +)
+#define os_atomic_sub(p, v, m) \
+ _os_atomic_c11_op((p), (v), m, sub, -)
+#define os_atomic_sub_orig(p, v, m) \
+ _os_atomic_c11_op_orig((p), (v), m, sub, -)
+#define os_atomic_and(p, v, m) \
+ _os_atomic_c11_op((p), (v), m, and, &)
+#define os_atomic_and_orig(p, v, m) \
+ _os_atomic_c11_op_orig((p), (v), m, and, &)
+#define os_atomic_or(p, v, m) \
+ _os_atomic_c11_op((p), (v), m, or, |)
+#define os_atomic_or_orig(p, v, m) \
+ _os_atomic_c11_op_orig((p), (v), m, or, |)
+#define os_atomic_xor(p, v, m) \
+ _os_atomic_c11_op((p), (v), m, xor, ^)
+#define os_atomic_xor_orig(p, v, m) \
+ _os_atomic_c11_op_orig((p), (v), m, xor, ^)
+
+#elif __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 2)
+#pragma mark -
+#pragma mark gnu99
+
+#define _os_atomic_full_barrier() \
+ __sync_synchronize()
+#define _os_atomic_barrier(m) \
+ ({ switch(os_atomic_memory_order_##m) { \
+ case _os_atomic_memory_order_relaxed: \
+ break; \
+ default: \
+ _os_atomic_full_barrier(); break; \
+ } })
+// seq_cst: only emulate explicit store(seq_cst) -> load(seq_cst)
+#define os_atomic_load(p, m) \
+ ({ typeof(*(p)) _r = *(p); \
+ switch(os_atomic_memory_order_##m) { \
+ case _os_atomic_memory_order_seq_cst: \
+ _os_atomic_barrier(m); /* fallthrough */ \
+ case _os_atomic_memory_order_relaxed: \
+ break; \
+ default: \
+ _os_atomic_unimplemented(); break; \
+ } _r; })
+#define os_atomic_store(p, v, m) \
+ ({ switch(os_atomic_memory_order_##m) { \
+ case _os_atomic_memory_order_release: \
+ case _os_atomic_memory_order_seq_cst: \
+ _os_atomic_barrier(m); /* fallthrough */ \
+ case _os_atomic_memory_order_relaxed: \
+ *(p) = (v); break; \
+ default: \
+ _os_atomic_unimplemented(); break; \
+ } switch(os_atomic_memory_order_##m) { \
+ case _os_atomic_memory_order_seq_cst: \
+ _os_atomic_barrier(m); break; \
+ default: \
+ break; \
+ } })
+#if __has_builtin(__sync_swap)
+#define os_atomic_xchg(p, v, m) \
+ ((typeof(*(p)))__sync_swap((p), (v)))
+#else
+#define os_atomic_xchg(p, v, m) \
+ ((typeof(*(p)))__sync_lock_test_and_set((p), (v)))
+#endif
+#define os_atomic_cmpxchg(p, e, v, m) \
+ __sync_bool_compare_and_swap((p), (e), (v))
+#define os_atomic_cmpxchgv(p, e, v, g, m) \
+ ({ typeof(*(g)) _e = (e), _r = \
+ __sync_val_compare_and_swap((p), _e, (v)); \
+ bool _b = (_e == _r); *(g) = _r; _b; })
+#define os_atomic_cmpxchgvw(p, e, v, g, m) \
+ os_atomic_cmpxchgv((p), (e), (v), (g), m)
+
+#define os_atomic_add(p, v, m) \
+ __sync_add_and_fetch((p), (v))
+#define os_atomic_add_orig(p, v, m) \
+ __sync_fetch_and_add((p), (v))
+#define os_atomic_sub(p, v, m) \
+ __sync_sub_and_fetch((p), (v))
+#define os_atomic_sub_orig(p, v, m) \
+ __sync_fetch_and_sub((p), (v))
+#define os_atomic_and(p, v, m) \
+ __sync_and_and_fetch((p), (v))
+#define os_atomic_and_orig(p, v, m) \
+ __sync_fetch_and_and((p), (v))
+#define os_atomic_or(p, v, m) \
+ __sync_or_and_fetch((p), (v))
+#define os_atomic_or_orig(p, v, m) \
+ __sync_fetch_and_or((p), (v))
+#define os_atomic_xor(p, v, m) \
+ __sync_xor_and_fetch((p), (v))
+#define os_atomic_xor_orig(p, v, m) \
+ __sync_fetch_and_xor((p), (v))
+
+#if defined(__x86_64__) || defined(__i386__)
+// GCC emits nothing for __sync_synchronize() on x86_64 & i386
+#undef _os_atomic_full_barrier
+#define _os_atomic_full_barrier() \
+ ({ __asm__ __volatile__( \
+ "mfence" \
+ : : : "memory"); })
+#undef os_atomic_load
+#define os_atomic_load(p, m) \
+ ({ switch(os_atomic_memory_order_##m) { \
+ case _os_atomic_memory_order_seq_cst: \
+ case _os_atomic_memory_order_relaxed: \
+ break; \
+ default: \
+ _os_atomic_unimplemented(); break; \
+ } *(p); })
+// xchg is faster than store + mfence
+#undef os_atomic_store
+#define os_atomic_store(p, v, m) \
+ ({ switch(os_atomic_memory_order_##m) { \
+ case _os_atomic_memory_order_relaxed: \
+ case _os_atomic_memory_order_release: \
+ *(p) = (v); break; \
+ case _os_atomic_memory_order_seq_cst: \
+ (void)os_atomic_xchg((p), (v), m); break; \
+ default:\
+ _os_atomic_unimplemented(); break; \
+ } })
+#endif
+
+#else
+#error "Please upgrade to GCC 4.2 or newer."
+#endif
+
+#pragma mark -
+#pragma mark generic
+
+// assume atomic builtins provide barriers
+#define os_atomic_barrier(m)
+// see comment in os_once.c
+#define os_atomic_maximally_synchronizing_barrier() \
+ _os_atomic_barrier(seq_cst)
+
+#define os_atomic_load2o(p, f, m) \
+ os_atomic_load(&(p)->f, m)
+#define os_atomic_store2o(p, f, v, m) \
+ os_atomic_store(&(p)->f, (v), m)
+#define os_atomic_xchg2o(p, f, v, m) \
+ os_atomic_xchg(&(p)->f, (v), m)
+#define os_atomic_cmpxchg2o(p, f, e, v, m) \
+ os_atomic_cmpxchg(&(p)->f, (e), (v), m)
+#define os_atomic_cmpxchgv2o(p, f, e, v, g, m) \
+ os_atomic_cmpxchgv(&(p)->f, (e), (v), (g), m)
+#define os_atomic_cmpxchgvw2o(p, f, e, v, g, m) \
+ os_atomic_cmpxchgvw(&(p)->f, (e), (v), (g), m)
+#define os_atomic_add2o(p, f, v, m) \
+ os_atomic_add(&(p)->f, (v), m)
+#define os_atomic_add_orig2o(p, f, v, m) \
+ os_atomic_add_orig(&(p)->f, (v), m)
+#define os_atomic_sub2o(p, f, v, m) \
+ os_atomic_sub(&(p)->f, (v), m)
+#define os_atomic_sub_orig2o(p, f, v, m) \
+ os_atomic_sub_orig(&(p)->f, (v), m)
+#define os_atomic_and2o(p, f, v, m) \
+ os_atomic_and(&(p)->f, (v), m)
+#define os_atomic_and_orig2o(p, f, v, m) \
+ os_atomic_and_orig(&(p)->f, (v), m)
+#define os_atomic_or2o(p, f, v, m) \
+ os_atomic_or(&(p)->f, (v), m)
+#define os_atomic_or_orig2o(p, f, v, m) \
+ os_atomic_or_orig(&(p)->f, (v), m)
+#define os_atomic_xor2o(p, f, v, m) \
+ os_atomic_xor(&(p)->f, (v), m)
+#define os_atomic_xor_orig2o(p, f, v, m) \
+ os_atomic_xor_orig(&(p)->f, (v), m)
+
+#define os_atomic_inc(p, m) \
+ os_atomic_add((p), 1, m)
+#define os_atomic_inc_orig(p, m) \
+ os_atomic_add_orig((p), 1, m)
+#define os_atomic_inc2o(p, f, m) \
+ os_atomic_add2o(p, f, 1, m)
+#define os_atomic_inc_orig2o(p, f, m) \
+ os_atomic_add_orig2o(p, f, 1, m)
+#define os_atomic_dec(p, m) \
+ os_atomic_sub((p), 1, m)
+#define os_atomic_dec_orig(p, m) \
+ os_atomic_sub_orig((p), 1, m)
+#define os_atomic_dec2o(p, f, m) \
+ os_atomic_sub2o(p, f, 1, m)
+#define os_atomic_dec_orig2o(p, f, m) \
+ os_atomic_sub_orig2o(p, f, 1, m)
+
+#define os_atomic_tsx_xacq_cmpxchgv(p, e, v, g) \
+ os_atomic_cmpxchgv((p), (e), (v), (g), acquire)
+#define os_atomic_tsx_xrel_store(p, v) \
+ os_atomic_store(p, v, release)
+#define os_atomic_tsx_xacq_cmpxchgv2o(p, f, e, v, g) \
+ os_atomic_tsx_xacq_cmpxchgv(&(p)->f, (e), (v), (g))
+#define os_atomic_tsx_xrel_store2o(p, f, v) \
+ os_atomic_tsx_xrel_store(&(p)->f, (v))
+
+#if defined(__x86_64__) || defined(__i386__)
+#pragma mark -
+#pragma mark x86
+
+#undef os_atomic_maximally_synchronizing_barrier
+#ifdef __LP64__
+#define os_atomic_maximally_synchronizing_barrier() \
+ ({ unsigned long _clbr; __asm__ __volatile__( \
+ "cpuid" \
+ : "=a" (_clbr) : "0" (0) : "rbx", "rcx", "rdx", "cc", "memory"); })
+#else
+#ifdef __llvm__
+#define os_atomic_maximally_synchronizing_barrier() \
+ ({ unsigned long _clbr; __asm__ __volatile__( \
+ "cpuid" \
+ : "=a" (_clbr) : "0" (0) : "ebx", "ecx", "edx", "cc", "memory"); })
+#else // gcc does not allow inline i386 asm to clobber ebx
+#define os_atomic_maximally_synchronizing_barrier() \
+ ({ unsigned long _clbr; __asm__ __volatile__( \
+ "pushl %%ebx\n\t" \
+ "cpuid\n\t" \
+ "popl %%ebx" \
+ : "=a" (_clbr) : "0" (0) : "ecx", "edx", "cc", "memory"); })
+#endif
+#endif
+
+
+#endif
+
+
+#endif // __OS_ATOMIC__
projects / apple / libpthread.git / commitdiff
