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Xavier Thompson
cython
Commits
f7c2c1ce
Commit
f7c2c1ce
authored
Nov 09, 2020
by
Xavier Thompson
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Optimise cypclass lock implementation assuming block acquisition semantics
parent
27953f00
Changes
1
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1 changed file
with
5 additions
and
26 deletions
+5
-26
Cython/Utility/CyObjects.cpp
Cython/Utility/CyObjects.cpp
+5
-26
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Cython/Utility/CyObjects.cpp
View file @
f7c2c1ce
...
@@ -79,35 +79,15 @@
...
@@ -79,35 +79,15 @@
}
}
void
CyObject_UNRLOCK
()
const
{
void
CyObject_UNRLOCK
()
const
{
int
retry
=
0
;
_readers
.
fetch_sub
(
1
);
while
(
true
)
{
uint32_t
prev_readers
=
_readers
;
if
(
prev_readers
+
1
>
1
)
{
uint32_t
new_readers
=
prev_readers
-
1
;
if
(
_readers
.
compare_exchange_weak
(
prev_readers
,
new_readers
))
{
return
;
}
}
else
{
return
;
}
retry
++
;
if
(
retry
>
RETRY_THRESHOLD
)
{
retry
=
0
;
std
::
this_thread
::
yield
();
}
}
}
}
void
CyObject_WLOCK
()
const
{
void
CyObject_WLOCK
()
const
{
int
retry
=
0
;
int
retry
=
0
;
while
(
true
)
{
while
(
true
)
{
uint32_t
prev_readers
=
_readers
;
uint32_t
prev_readers
=
0
;
if
(
prev_readers
==
0
)
{
if
(
_readers
.
compare_exchange_weak
(
prev_readers
,
HAS_WRITER
))
{
if
(
_readers
.
compare_exchange_weak
(
prev_readers
,
HAS_WRITER
))
{
return
;
return
;
}
}
}
retry
++
;
retry
++
;
...
@@ -124,8 +104,7 @@
...
@@ -124,8 +104,7 @@
}
}
void
CyObject_UNWLOCK
()
const
{
void
CyObject_UNWLOCK
()
const
{
uint32_t
prev_readers
=
HAS_WRITER
;
_readers
.
store
(
0
);
_readers
.
compare_exchange_strong
(
prev_readers
,
0
);
}
}
};
};
...
...
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