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81a76f4827
This solely manipulates the thread_info struct, it ought to be in tinfo.h, not in thread.h.
67 lines
2.1 KiB
C
67 lines
2.1 KiB
C
/*
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* include/haproxy/tinfo.h
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* Export of ha_thread_info[] and ti pointer.
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*
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* Copyright (C) 2020 Willy Tarreau - w@1wt.eu
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation, version 2.1
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* exclusively.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef _HAPROXY_TINFO_H
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#define _HAPROXY_TINFO_H
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#include <haproxy/api.h>
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#include <haproxy/tinfo-t.h>
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/* the struct is in thread.c */
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extern struct thread_info ha_thread_info[MAX_THREADS];
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extern THREAD_LOCAL struct thread_info *ti; /* thread_info for the current thread */
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/* Retrieves the opaque pthread_t of thread <thr> cast to an unsigned long long
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* since POSIX took great care of not specifying its representation, making it
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* hard to export for post-mortem analysis. For this reason we copy it into a
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* union and will use the smallest scalar type at least as large as its size,
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* which will keep endianness and alignment for all regular sizes. As a last
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* resort we end up with a long long ligned to the first bytes in memory, which
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* will be endian-dependent if pthread_t is larger than a long long (not seen
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* yet).
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*/
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static inline unsigned long long ha_get_pthread_id(unsigned int thr)
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{
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#ifdef USE_THREAD
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union {
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pthread_t t;
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unsigned long long ll;
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unsigned int i;
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unsigned short s;
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unsigned char c;
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} u = { 0 };
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u.t = ha_thread_info[thr].pthread;
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if (sizeof(u.t) <= sizeof(u.c))
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return u.c;
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else if (sizeof(u.t) <= sizeof(u.s))
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return u.s;
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else if (sizeof(u.t) <= sizeof(u.i))
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return u.i;
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return u.ll;
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#else
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return 0;
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#endif
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}
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#endif /* _HAPROXY_TINFO_H */
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