a764af68be
This change fixes possibly invalid access to the internal data structure during library shutdown. In a heavily oversubscribed situation, the library shutdown sequence can reach the point where resources are deallocated while there still exist threads in their final spinning loop. The added loop in __kmp_internal_end() checks if there are such busy-waiting threads and blocks the shutdown sequence if that is the case. Two versions of kmp_wait_template() are now used to minimize performance impact. Patch by Hansang Bae Differential Revision: https://reviews.llvm.org/D49452 llvm-svn: 337486
27 lines
892 B
C++
27 lines
892 B
C++
/*
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* kmp_wait_release.cpp -- Wait/Release implementation
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*/
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//===----------------------------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.txt for details.
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//
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//===----------------------------------------------------------------------===//
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#include "kmp_wait_release.h"
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void __kmp_wait_64(kmp_info_t *this_thr, kmp_flag_64 *flag,
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int final_spin USE_ITT_BUILD_ARG(void *itt_sync_obj)) {
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if (final_spin)
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__kmp_wait_template<kmp_flag_64, TRUE>(
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this_thr, flag USE_ITT_BUILD_ARG(itt_sync_obj));
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else
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__kmp_wait_template<kmp_flag_64, FALSE>(
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this_thr, flag USE_ITT_BUILD_ARG(itt_sync_obj));
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}
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void __kmp_release_64(kmp_flag_64 *flag) { __kmp_release_template(flag); }
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