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async-profiler/src/threadFilter.cpp at master · parca-dev/async-profiler · GitHub
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/*
* Copyright 2020 Andrei Pangin
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#
include
<
stdlib.h
>
#
include
<
string.h
>
#
include
"
threadFilter.h
"
#
include
"
os.h
"
ThreadFilter::ThreadFilter
() {
memset
(_bitmap,
0
,
sizeof
(_bitmap));
_bitmap[
0
] = (
u32
*)
OS::safeAlloc
(
BITMAP_SIZE
);
_enabled =
false
;
_size =
0
;
}
ThreadFilter::~ThreadFilter
() {
for
(
int
i =
0
; i <
MAX_BITMAPS
; i++) {
if
(_bitmap[i] !=
NULL
) {
OS::safeFree
(_bitmap[i],
BITMAP_SIZE
);
}
}
}
void
ThreadFilter::init
(
const
char
* filter) {
if
(filter ==
NULL
) {
_enabled =
false
;
return
;
}
char
* end;
do
{
int
id =
strtol
(filter, &end,
0
);
if
(id <=
0
) {
break
;
}
if
(*end ==
'
-
'
) {
int
to =
strtol
(end +
1
, &end,
0
);
while
(id <= to) {
add
(id++);
}
}
else
{
add
(id);
}
filter = end +
1
;
}
while
(*end);
_enabled =
true
;
}
void
ThreadFilter::clear
() {
for
(
int
i =
0
; i <
MAX_BITMAPS
; i++) {
if
(_bitmap[i] !=
NULL
) {
memset
(_bitmap[i],
0
,
BITMAP_SIZE
);
}
}
_size =
0
;
}
size_t
ThreadFilter::usedMemory
() {
size_t
bytes =
0
;
for
(
int
i =
0
; i <
MAX_BITMAPS
; i++) {
if
(_bitmap[i] !=
NULL
) {
bytes +=
BITMAP_SIZE
;
}
}
return
bytes;
}
bool
ThreadFilter::accept
(
int
thread_id) {
u32
* b =
bitmap
(thread_id);
return
b !=
NULL
&& (
word
(b, thread_id) & (
1
<< (thread_id &
0x1f
)));
}
void
ThreadFilter::add
(
int
thread_id) {
u32
* b =
bitmap
(thread_id);
if
(b ==
NULL
) {
b = (
u32
*)
OS::safeAlloc
(
BITMAP_SIZE
);
u32
* oldb =
__sync_val_compare_and_swap
(&_bitmap[(
u32
)thread_id /
BITMAP_CAPACITY
],
NULL
, b);
if
(oldb !=
NULL
) {
OS::safeFree
(b,
BITMAP_SIZE
);
b = oldb;
}
}
u32
bit =
1
<< (thread_id &
0x1f
);
if
(!(
__sync_fetch_and_or
(&
word
(b, thread_id), bit) & bit)) {
atomicInc
(_size);
}
}
void
ThreadFilter::remove
(
int
thread_id) {
u32
* b =
bitmap
(thread_id);
if
(b ==
NULL
) {
return
;
}
u32
bit =
1
<< (thread_id &
0x1f
);
if
(
__sync_fetch_and_and
(&
word
(b, thread_id), ~bit) & bit) {
atomicInc
(_size, -
1
);
}
}
void
ThreadFilter::collect
(std::vector<
int
>& v) {
for
(
int
i =
0
; i <
MAX_BITMAPS
; i++) {
u32
* b = _bitmap[i];
if
(b !=
NULL
) {
int
start_id = i *
BITMAP_CAPACITY
;
for
(
int
j =
0
; j <
BITMAP_SIZE
/
sizeof
(
u32
); j++) {
u32
word = b[j];
if
(word) {
for
(
int
bit =
0
; bit <
32
; bit++) {
if
(word & (
1
<< bit)) {
v.
push_back
(start_id + j *
32
+ bit);
}
}
}
}
}
}
}
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