[gcc r11-5227] libstdc++: Fix atomic waiting for non-linux targets
Jonathan Wakely
redi@gcc.gnu.org
Sat Nov 21 17:50:22 GMT 2020
https://gcc.gnu.org/g:62d19588b9a08077dce7990d90dc61033a0b240d
commit r11-5227-g62d19588b9a08077dce7990d90dc61033a0b240d
Author: Jonathan Wakely <jwakely@redhat.com>
Date: Sat Nov 21 16:52:22 2020 +0000
libstdc++: Fix atomic waiting for non-linux targets
This fixes some UNRESOLVED tests on (at least) Solaris and Darwin, and
disables some tests that hang forever on Solaris. A proper fix is still
needed.
libstdc++-v3/ChangeLog:
* include/bits/atomic_base.h (atomic_flag::wait): Use correct
type for __atomic_wait call.
* include/bits/atomic_timed_wait.h (__atomic_wait_until): Check
_GLIBCXX_HAVE_LINUX_FUTEX.
* include/bits/atomic_wait.h (__atomic_notify): Likewise.
* include/bits/semaphore_base.h (_GLIBCXX_HAVE_POSIX_SEMAPHORE):
Only define if SEM_VALUE_MAX or _POSIX_SEM_VALUE_MAX is defined.
* testsuite/29_atomics/atomic/wait_notify/bool.cc: Disable on
non-linux targes.
* testsuite/29_atomics/atomic/wait_notify/generic.cc: Likewise.
* testsuite/29_atomics/atomic/wait_notify/pointers.cc: Likewise.
* testsuite/29_atomics/atomic_flag/wait_notify/1.cc: Likewise.
* testsuite/29_atomics/atomic_float/wait_notify.cc: Likewise.
Diff:
---
libstdc++-v3/include/bits/atomic_base.h | 2 +-
libstdc++-v3/include/bits/atomic_timed_wait.h | 2 ++
libstdc++-v3/include/bits/atomic_wait.h | 2 ++
libstdc++-v3/include/bits/semaphore_base.h | 10 ++++++++--
libstdc++-v3/testsuite/29_atomics/atomic/wait_notify/bool.cc | 5 +++--
.../testsuite/29_atomics/atomic/wait_notify/generic.cc | 5 +++--
.../testsuite/29_atomics/atomic/wait_notify/pointers.cc | 5 +++--
libstdc++-v3/testsuite/29_atomics/atomic_flag/wait_notify/1.cc | 5 +++--
libstdc++-v3/testsuite/29_atomics/atomic_float/wait_notify.cc | 5 +++--
9 files changed, 28 insertions(+), 13 deletions(-)
diff --git a/libstdc++-v3/include/bits/atomic_base.h b/libstdc++-v3/include/bits/atomic_base.h
index dd4db926592..7de02f16997 100644
--- a/libstdc++-v3/include/bits/atomic_base.h
+++ b/libstdc++-v3/include/bits/atomic_base.h
@@ -234,7 +234,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
wait(bool __old,
memory_order __m = memory_order_seq_cst) const noexcept
{
- std::__atomic_wait(&_M_i, __old,
+ std::__atomic_wait(&_M_i, static_cast<__atomic_flag_data_type>(__old),
[__m, this, __old]()
{ return this->test(__m) != __old; });
}
diff --git a/libstdc++-v3/include/bits/atomic_timed_wait.h b/libstdc++-v3/include/bits/atomic_timed_wait.h
index 7712a6c591d..405f7e93ca8 100644
--- a/libstdc++-v3/include/bits/atomic_timed_wait.h
+++ b/libstdc++-v3/include/bits/atomic_timed_wait.h
@@ -240,12 +240,14 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
do
{
__atomic_wait_status __res;
+#ifdef _GLIBCXX_HAVE_LINUX_FUTEX
if constexpr (__platform_wait_uses_type<_Tp>)
{
__res = __detail::__platform_wait_until((__platform_wait_t*)(void*) __addr,
__old, __atime);
}
else
+#endif
{
__res = __w._M_do_wait_until(__version, __atime);
}
diff --git a/libstdc++-v3/include/bits/atomic_wait.h b/libstdc++-v3/include/bits/atomic_wait.h
index 2d08e5325fb..7b2682a577e 100644
--- a/libstdc++-v3/include/bits/atomic_wait.h
+++ b/libstdc++-v3/include/bits/atomic_wait.h
@@ -292,11 +292,13 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
if (!__w._M_waiting())
return;
+#ifdef _GLIBCXX_HAVE_LINUX_FUTEX
if constexpr (__platform_wait_uses_type<_Tp>)
{
__platform_notify((__platform_wait_t*)(void*) __addr, __all);
}
else
+#endif
{
__w._M_notify(__all);
}
diff --git a/libstdc++-v3/include/bits/semaphore_base.h b/libstdc++-v3/include/bits/semaphore_base.h
index da6dc4b9185..78a0b6ba26e 100644
--- a/libstdc++-v3/include/bits/semaphore_base.h
+++ b/libstdc++-v3/include/bits/semaphore_base.h
@@ -39,8 +39,10 @@
#include <ext/numeric_traits.h>
#if __has_include(<semaphore.h>)
-#define _GLIBCXX_HAVE_POSIX_SEMAPHORE 1
-#include <semaphore.h>
+# include <semaphore.h>
+# if defined SEM_VALUE_MAX || _POSIX_SEM_VALUE_MAX
+# define _GLIBCXX_HAVE_POSIX_SEMAPHORE 1
+# endif
#endif
#include <chrono>
@@ -54,7 +56,11 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
struct __platform_semaphore
{
using __clock_t = chrono::system_clock;
+#ifdef SEM_VALUE_MAX
static constexpr ptrdiff_t _S_max = SEM_VALUE_MAX;
+#else
+ static constexpr ptrdiff_t _S_max = _POSIX_SEM_VALUE_MAX;
+#endif
explicit __platform_semaphore(ptrdiff_t __count) noexcept
{
diff --git a/libstdc++-v3/testsuite/29_atomics/atomic/wait_notify/bool.cc b/libstdc++-v3/testsuite/29_atomics/atomic/wait_notify/bool.cc
index 5f1e30a710f..29781c6e135 100644
--- a/libstdc++-v3/testsuite/29_atomics/atomic/wait_notify/bool.cc
+++ b/libstdc++-v3/testsuite/29_atomics/atomic/wait_notify/bool.cc
@@ -1,7 +1,8 @@
-// { dg-options "-std=gnu++2a -pthread" }
+// { dg-options "-std=gnu++2a" }
// { dg-do run { target c++2a } }
-// { dg-require-effective-target pthread }
// { dg-require-gthreads "" }
+// { dg-additional-options "-pthread" { target pthread } }
+// { dg-skip-if "broken" { ! *-*-*linux } }
// Copyright (C) 2020 Free Software Foundation, Inc.
//
diff --git a/libstdc++-v3/testsuite/29_atomics/atomic/wait_notify/generic.cc b/libstdc++-v3/testsuite/29_atomics/atomic/wait_notify/generic.cc
index 0249341055c..629556a9d2d 100644
--- a/libstdc++-v3/testsuite/29_atomics/atomic/wait_notify/generic.cc
+++ b/libstdc++-v3/testsuite/29_atomics/atomic/wait_notify/generic.cc
@@ -1,7 +1,8 @@
-// { dg-options "-std=gnu++2a -pthread" }
+// { dg-options "-std=gnu++2a" }
// { dg-do run { target c++2a } }
-// { dg-require-effective-target pthread }
// { dg-require-gthreads "" }
+// { dg-additional-options "-pthread" { target pthread } }
+// { dg-skip-if "broken" { ! *-*-*linux } }
// Copyright (C) 2020 Free Software Foundation, Inc.
//
diff --git a/libstdc++-v3/testsuite/29_atomics/atomic/wait_notify/pointers.cc b/libstdc++-v3/testsuite/29_atomics/atomic/wait_notify/pointers.cc
index 8531bb2e788..f54961f893d 100644
--- a/libstdc++-v3/testsuite/29_atomics/atomic/wait_notify/pointers.cc
+++ b/libstdc++-v3/testsuite/29_atomics/atomic/wait_notify/pointers.cc
@@ -1,7 +1,8 @@
-// { dg-options "-std=gnu++2a -pthread" }
+// { dg-options "-std=gnu++2a" }
// { dg-do run { target c++2a } }
-// { dg-require-effective-target pthread }
+// { dg-additional-options "-pthread" { target pthread } }
// { dg-require-gthreads "" }
+// { dg-skip-if "broken" { ! *-*-*linux } }
// Copyright (C) 2020 Free Software Foundation, Inc.
//
diff --git a/libstdc++-v3/testsuite/29_atomics/atomic_flag/wait_notify/1.cc b/libstdc++-v3/testsuite/29_atomics/atomic_flag/wait_notify/1.cc
index 4f026e1dc9c..763d3e77159 100644
--- a/libstdc++-v3/testsuite/29_atomics/atomic_flag/wait_notify/1.cc
+++ b/libstdc++-v3/testsuite/29_atomics/atomic_flag/wait_notify/1.cc
@@ -1,7 +1,8 @@
-// { dg-options "-std=gnu++2a -pthread" }
+// { dg-options "-std=gnu++2a" }
// { dg-do run { target c++2a } }
-// { dg-require-effective-target pthread }
// { dg-require-gthreads "" }
+// { dg-additional-options "-pthread" { target pthread } }
+// { dg-skip-if "broken" { ! *-*-*linux } }
// Copyright (C) 2020 Free Software Foundation, Inc.
//
diff --git a/libstdc++-v3/testsuite/29_atomics/atomic_float/wait_notify.cc b/libstdc++-v3/testsuite/29_atomics/atomic_float/wait_notify.cc
index 640a84e0342..27d9b601c2f 100644
--- a/libstdc++-v3/testsuite/29_atomics/atomic_float/wait_notify.cc
+++ b/libstdc++-v3/testsuite/29_atomics/atomic_float/wait_notify.cc
@@ -1,7 +1,8 @@
-// { dg-options "-std=gnu++2a -pthread" }
+// { dg-options "-std=gnu++2a" }
// { dg-do run { target c++2a } }
-// { dg-require-effective-target pthread }
// { dg-require-gthreads "" }
+// { dg-additional-options "-pthread" { target pthread } }
+// { dg-skip-if "broken" { ! *-*-*linux } }
// Copyright (C) 2020 Free Software Foundation, Inc.
//
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