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* [gcc/devel/c++-modules] libstdc++: Fix <stop_token> to compile without gthreads
@ 2020-08-27 18:06 Nathan Sidwell
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From: Nathan Sidwell @ 2020-08-27 18:06 UTC (permalink / raw)
To: gcc-cvs, libstdc++-cvs
https://gcc.gnu.org/g:35e5294c4b779f8fc24fdc86464f999867332995
commit 35e5294c4b779f8fc24fdc86464f999867332995
Author: Jonathan Wakely <jwakely@redhat.com>
Date: Tue Aug 11 16:16:21 2020 +0100
libstdc++: Fix <stop_token> to compile without gthreads
libstdc++-v3/ChangeLog:
* include/std/stop_token: Check _GLIBCXX_HAS_GTHREADS using
#ifdef instead of #if.
(stop_token::_S_yield()): Check _GLIBCXX_HAS_GTHREADS before
using __gthread_yield.
Diff:
---
libstdc++-v3/include/std/stop_token | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
diff --git a/libstdc++-v3/include/std/stop_token b/libstdc++-v3/include/std/stop_token
index 847d12f7454..ccec6fab15c 100644
--- a/libstdc++-v3/include/std/stop_token
+++ b/libstdc++-v3/include/std/stop_token
@@ -105,7 +105,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
{
#if defined __i386__ || defined __x86_64__
__builtin_ia32_pause();
-#elif defined _GLIBCXX_USE_SCHED_YIELD
+#elif defined _GLIBCXX_HAS_GTHREADS && defined _GLIBCXX_USE_SCHED_YIELD
__gthread_yield();
#endif
}
@@ -162,7 +162,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
std::atomic<value_type> _M_owners{1};
std::atomic<value_type> _M_value{_S_ssrc_counter_inc};
_Stop_cb* _M_head = nullptr;
-#if _GLIBCXX_HAS_GTHREADS
+#ifdef _GLIBCXX_HAS_GTHREADS
__gthread_t _M_requester;
#endif
@@ -237,7 +237,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
}
while (!_M_try_lock_and_stop(__old));
-#if _GLIBCXX_HAS_GTHREADS
+#ifdef _GLIBCXX_HAS_GTHREADS
_M_requester = __gthread_self();
#endif
@@ -266,7 +266,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
if (!__destroyed)
{
__cb->_M_destroyed = nullptr;
-#if _GLIBCXX_HAS_GTHREADS
+#ifdef _GLIBCXX_HAS_GTHREADS
// synchronize with destructor of stop_callback that owns *__cb
__cb->_M_done.release();
#endif
@@ -343,7 +343,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
// Callback is not in the list, so must have been removed by a call to
// _M_request_stop.
-#if _GLIBCXX_HAS_GTHREADS
+#ifdef _GLIBCXX_HAS_GTHREADS
// Despite appearances there is no data race on _M_requester. The only
// write to it happens before the callback is removed from the list,
// and removing it from the list happens before this read.
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