48 lines
1.3 KiB
C++
48 lines
1.3 KiB
C++
// value.h
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/**
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* Copyright (C) 2008 10gen Inc.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License, version 3,
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,b
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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
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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namespace mongo {
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/** this string COULD be mangled but with the double buffering, assuming writes
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are infrequent, it's unlikely. thus, this is reasonable for lockless setting of
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diagnostic strings, where their content isn't critical.
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*/
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class DiagStr {
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char buf1[256];
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char buf2[256];
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char *p;
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public:
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DiagStr() {
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memset(buf1, 0, 256);
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memset(buf2, 0, 256);
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p = buf1;
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}
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const char * get() const { return p; }
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void set(const char *s) {
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char *q = (p==buf1) ? buf2 : buf1;
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strncpy(q, s, 255);
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p = q;
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}
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};
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}
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