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/* -*- mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*- */
#ident "$Id$"
/*======
This file is part of PerconaFT.
Copyright (c) 2006, 2015, Percona and/or its affiliates. All rights reserved.
PerconaFT is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License, version 2,
as published by the Free Software Foundation.
PerconaFT is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with PerconaFT. If not, see <http://www.gnu.org/licenses/>.
----------------------------------------
PerconaFT is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License, version 3,
as published by the Free Software Foundation.
PerconaFT is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with PerconaFT. If not, see <http://www.gnu.org/licenses/>.
======= */
#ident "Copyright (c) 2006, 2015, Percona and/or its affiliates. All rights reserved."
#include <cstdint>
#include "malloc_utils.hpp"
#if !defined(HAVE_BITS_FUNCTEXCEPT_H)
namespace std {
void __throw_bad_alloc() {
throw bad_alloc();
}
} // namespace std
#endif
namespace malloc_utils {
// How do we determine that we're using jemalloc?
// In the hackiest way possible. We allocate memory using malloc() and see if
// the per-thread counter of allocated memory increases. This makes me feel
// dirty inside. Also note that this requires jemalloc to have been compiled
// with --enable-stats.
bool usingJEMallocSlow() {
// Some platforms (*cough* OSX *cough*) require weak symbol checks to be
// in the form if (mallctl != nullptr). Not if (mallctl) or if (!mallctl)
// (!!). http://goo.gl/xpmctm
if (mallocx == nullptr || rallocx == nullptr || xallocx == nullptr
|| sallocx == nullptr || dallocx == nullptr || nallocx == nullptr
|| mallctl == nullptr) {
return false;
}
// "volatile" because gcc optimizes out the reads from *counter, because
// it "knows" malloc doesn't modify global state...
volatile uint64_t* counter;
size_t counterLen = sizeof(uint64_t*);
if (mallctl("thread.allocatedp", static_cast<void*>(&counter), &counterLen,
nullptr, 0) != 0) {
return false;
}
if (counterLen != sizeof(uint64_t*)) {
return false;
}
uint64_t origAllocated = *counter;
void* ptr = malloc(1);
if (!ptr) {
// wtf, failing to allocate 1 byte
return false;
}
free(ptr);
return (origAllocated != *counter);
}
} // namespace malloc_utils
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