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Commit
d38f584b
authored
Apr 18, 2019
by
FritzFlorian
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Refacotor spinlocks to make it simpler to insert actions after CAS fails.
parent
2fece910
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2 changed files
with
22 additions
and
9 deletions
+22
-9
lib/pls/src/internal/base/tas_spin_lock.cpp
+11
-3
lib/pls/src/internal/base/ttas_spin_lock.cpp
+11
-6
No files found.
lib/pls/src/internal/base/tas_spin_lock.cpp
View file @
d38f584b
...
...
@@ -8,26 +8,34 @@ namespace base {
void
tas_spin_lock
::
lock
()
{
PROFILE_LOCK
(
"Acquire Lock"
)
int
tries
=
0
;
while
(
flag_
.
test_and_set
(
std
::
memory_order_acquire
)
)
{
while
(
true
)
{
tries
++
;
if
(
tries
%
yield_at_tries_
==
0
)
{
this_thread
::
yield
();
}
if
(
flag_
.
test_and_set
(
std
::
memory_order_acquire
)
==
0
)
{
return
;
}
}
}
bool
tas_spin_lock
::
try_lock
(
unsigned
int
num_tries
)
{
PROFILE_LOCK
(
"Try Acquire Lock"
)
while
(
flag_
.
test_and_set
(
std
::
memory_order_acquire
)
)
{
while
(
true
)
{
num_tries
--
;
if
(
num_tries
<=
0
)
{
return
false
;
}
if
(
flag_
.
test_and_set
(
std
::
memory_order_acquire
)
==
0
)
{
return
true
;
}
}
return
true
;
}
void
tas_spin_lock
::
unlock
()
{
PROFILE_LOCK
(
"Unlock"
)
flag_
.
clear
(
std
::
memory_order_release
);
}
...
...
lib/pls/src/internal/base/ttas_spin_lock.cpp
View file @
d38f584b
...
...
@@ -10,7 +10,7 @@ void ttas_spin_lock::lock() {
int
tries
=
0
;
int
expected
=
0
;
do
{
while
(
true
)
{
while
(
flag_
.
load
(
std
::
memory_order_relaxed
)
==
1
)
{
tries
++
;
if
(
tries
%
yield_at_tries_
==
0
)
{
...
...
@@ -19,14 +19,17 @@ void ttas_spin_lock::lock() {
}
expected
=
0
;
}
while
(
!
flag_
.
compare_exchange_weak
(
expected
,
1
,
std
::
memory_order_acquire
));
if
(
flag_
.
compare_exchange_weak
(
expected
,
1
,
std
::
memory_order_acquire
))
{
return
;
}
}
}
bool
ttas_spin_lock
::
try_lock
(
unsigned
int
num_tries
)
{
PROFILE_LOCK
(
"Try Acquire Lock"
)
int
expected
=
0
;
do
{
while
(
true
)
{
while
(
flag_
.
load
(
std
::
memory_order_relaxed
)
==
1
)
{
num_tries
--
;
if
(
num_tries
<=
0
)
{
...
...
@@ -35,12 +38,14 @@ bool ttas_spin_lock::try_lock(unsigned int num_tries) {
}
expected
=
0
;
}
while
(
!
flag_
.
compare_exchange_weak
(
expected
,
1
,
std
::
memory_order_acquire
));
return
true
;
if
(
flag_
.
compare_exchange_weak
(
expected
,
1
,
std
::
memory_order_acquire
))
{
return
true
;
}
}
}
void
ttas_spin_lock
::
unlock
()
{
PROFILE_LOCK
(
"Unlock"
)
flag_
.
store
(
0
,
std
::
memory_order_release
);
}
...
...
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