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amputate HAVE_FORK checking

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Pretty much everything has fork, except windows. Which is much simpler
to test at compile time, then duplicating and complicating the test at
configure time.
This commit is contained in:
Aliaksey Kandratsenka 2024-01-25 16:10:30 -05:00
parent 8cc2d93055
commit 79b6ad2ab5
5 changed files with 20 additions and 31 deletions
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1
CMakeLists.txt
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@ -199,7 +199,6 @@ set(CMAKE_EXTRA_INCLUDE_FILES)
check_function_exists("sbrk" HAVE_SBRK) # for tcmalloc to get memory
check_function_exists("__sbrk" HAVE___SBRK) # for tcmalloc to get memory
check_function_exists("geteuid" HAVE_GETEUID) # for turning off services when run as root
check_function_exists("fork" HAVE_FORK) # for the pthread_atfork setup
check_include_file("features.h" HAVE_FEATURES_H) # for vdso_support.h, Where __GLIBC__ is defined
check_include_file("malloc.h" HAVE_MALLOC_H) # some systems define stuff there, others not
check_include_file("glob.h" HAVE_GLOB_H) # for heap-profile-table (cleaning up profiles)

3
cmake/config.h.in
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@ -74,9 +74,6 @@
/* Define to 1 if you have the <features.h> header file. */
#cmakedefine HAVE_FEATURES_H
/* Define to 1 if you have the `fork' function. */
#cmakedefine HAVE_FORK
/* Define to 1 if you have the `geteuid' function. */
#cmakedefine HAVE_GETEUID

42
src/static_vars.cc
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@ -46,26 +46,6 @@
namespace tcmalloc {
#if defined(HAVE_FORK) && defined(HAVE_PTHREAD)
// These following two functions are registered via pthread_atfork to make
// sure the central_cache locks remain in a consisten state in the forked
// version of the thread.
void CentralCacheLockAll() NO_THREAD_SAFETY_ANALYSIS
{
Static::pageheap_lock()->Lock();
for (int i = 0; i < Static::num_size_classes(); ++i)
Static::central_cache()[i].Lock();
}
void CentralCacheUnlockAll() NO_THREAD_SAFETY_ANALYSIS
{
for (int i = 0; i < Static::num_size_classes(); ++i)
Static::central_cache()[i].Unlock();
Static::pageheap_lock()->Unlock();
}
#endif
bool Static::inited_;
SizeMap Static::sizemap_;
CentralFreeListPadded Static::central_cache_[kClassSizesMax];
@ -108,9 +88,27 @@ void Static::InitStaticVars() {
DLL_Init(&sampled_objects_);
}
// These following two functions are registered via pthread_atfork to
// make sure the central_cache locks remain in a consisten state in
// the forked version of the thread. Also our OSX integration uses it
// for mi_force_lock.
void CentralCacheLockAll() NO_THREAD_SAFETY_ANALYSIS
{
Static::pageheap_lock()->Lock();
for (int i = 0; i < Static::num_size_classes(); ++i)
Static::central_cache()[i].Lock();
}
void CentralCacheUnlockAll() NO_THREAD_SAFETY_ANALYSIS
{
for (int i = 0; i < Static::num_size_classes(); ++i)
Static::central_cache()[i].Unlock();
Static::pageheap_lock()->Unlock();
}
void Static::InitLateMaybeRecursive() {
#if defined(HAVE_FORK) && defined(HAVE_PTHREAD) \
&& !defined(__APPLE__) && !defined(TCMALLOC_NO_ATFORK) \
#if !defined(__APPLE__) && !defined(_WIN32) && !defined(TCMALLOC_NO_ATFORK) \
&& !defined(PTHREADS_CRASHES_IF_RUN_TOO_EARLY)
// OSX has it's own way of handling atfork in malloc (see
// libc_override_osx.h).

3
src/windows/config.h
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@ -93,9 +93,6 @@
/* Define to 1 if you have the <features.h> header file. */
/* #undef HAVE_FEATURES_H */
/* Define to 1 if you have the `fork' function. */
/* #undef HAVE_FORK */
/* Define to 1 if you have the `geteuid' function. */
/* #undef HAVE_GETEUID */

2
src/windows/mingw.h
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@ -54,8 +54,6 @@
# define _WIN32_WINNT 0x0501
#endif
#undef HAVE_FORK
#include "windows/port.h"
#endif /* __MINGW32__ */