1/* -*- mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*- */
2#ident "$Id$"
3/*======
4This file is part of PerconaFT.
5
6
7Copyright (c) 2006, 2015, Percona and/or its affiliates. All rights reserved.
8
9 PerconaFT is free software: you can redistribute it and/or modify
10 it under the terms of the GNU General Public License, version 2,
11 as published by the Free Software Foundation.
12
13 PerconaFT is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with PerconaFT. If not, see <http://www.gnu.org/licenses/>.
20
21----------------------------------------
22
23 PerconaFT is free software: you can redistribute it and/or modify
24 it under the terms of the GNU Affero General Public License, version 3,
25 as published by the Free Software Foundation.
26
27 PerconaFT is distributed in the hope that it will be useful,
28 but WITHOUT ANY WARRANTY; without even the implied warranty of
29 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
30 GNU Affero General Public License for more details.
31
32 You should have received a copy of the GNU Affero General Public License
33 along with PerconaFT. If not, see <http://www.gnu.org/licenses/>.
34======= */
35
36#ident "Copyright (c) 2006, 2015, Percona and/or its affiliates. All rights reserved."
37
38#include <cstdint>
39
40#include "malloc_utils.hpp"
41
42#if !defined(HAVE_BITS_FUNCTEXCEPT_H)
43
44namespace std {
45
46 void __throw_bad_alloc() {
47 throw bad_alloc();
48 }
49
50} // namespace std
51
52#endif
53
54namespace malloc_utils {
55
56 // How do we determine that we're using jemalloc?
57 // In the hackiest way possible. We allocate memory using malloc() and see if
58 // the per-thread counter of allocated memory increases. This makes me feel
59 // dirty inside. Also note that this requires jemalloc to have been compiled
60 // with --enable-stats.
61 bool usingJEMallocSlow() {
62 // Some platforms (*cough* OSX *cough*) require weak symbol checks to be
63 // in the form if (mallctl != nullptr). Not if (mallctl) or if (!mallctl)
64 // (!!). http://goo.gl/xpmctm
65 if (mallocx == nullptr || rallocx == nullptr || xallocx == nullptr
66 || sallocx == nullptr || dallocx == nullptr || nallocx == nullptr
67 || mallctl == nullptr) {
68 return false;
69 }
70
71 // "volatile" because gcc optimizes out the reads from *counter, because
72 // it "knows" malloc doesn't modify global state...
73 volatile uint64_t* counter;
74 size_t counterLen = sizeof(uint64_t*);
75
76 if (mallctl("thread.allocatedp", static_cast<void*>(&counter), &counterLen,
77 nullptr, 0) != 0) {
78 return false;
79 }
80
81 if (counterLen != sizeof(uint64_t*)) {
82 return false;
83 }
84
85 uint64_t origAllocated = *counter;
86
87 void* ptr = malloc(1);
88 if (!ptr) {
89 // wtf, failing to allocate 1 byte
90 return false;
91 }
92 free(ptr);
93
94 return (origAllocated != *counter);
95 }
96
97} // namespace malloc_utils
98