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8bf1c5d6
编写于
3月 29, 2013
作者:
B
Bernard Xiong
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差异文件
Merge pull request #62 from rogerz/pthread-comments
add comments to help understanding pthread
上级
aaf01868
e9cf10da
变更
2
隐藏空白更改
内联
并排
Showing
2 changed file
with
13 addition
and
5 deletion
+13
-5
components/pthreads/pthread.h
components/pthreads/pthread.h
+3
-3
components/pthreads/pthread_rwlock.c
components/pthreads/pthread_rwlock.c
+10
-2
未找到文件。
components/pthreads/pthread.h
浏览文件 @
8bf1c5d6
...
@@ -104,9 +104,9 @@ struct pthread_rwlock
...
@@ -104,9 +104,9 @@ struct pthread_rwlock
pthread_cond_t
rw_condreaders
;
/* for reader threads waiting */
pthread_cond_t
rw_condreaders
;
/* for reader threads waiting */
pthread_cond_t
rw_condwriters
;
/* for writer threads waiting */
pthread_cond_t
rw_condwriters
;
/* for writer threads waiting */
int
rw_nwaitreaders
;
/* the number waiting */
int
rw_nwaitreaders
;
/* the number
of reader threads
waiting */
int
rw_nwaitwriters
;
/* the number waiting */
int
rw_nwaitwriters
;
/* the number
of writer threads
waiting */
int
rw_refcount
;
int
rw_refcount
;
/* 0: unlocked, -1: locked by writer, > 0 locked by n readers */
};
};
typedef
struct
pthread_rwlock
pthread_rwlock_t
;
typedef
struct
pthread_rwlock
pthread_rwlock_t
;
...
...
components/pthreads/pthread_rwlock.c
浏览文件 @
8bf1c5d6
...
@@ -112,9 +112,11 @@ int pthread_rwlock_rdlock (pthread_rwlock_t *rwlock)
...
@@ -112,9 +112,11 @@ int pthread_rwlock_rdlock (pthread_rwlock_t *rwlock)
while
(
rwlock
->
rw_refcount
<
0
||
rwlock
->
rw_nwaitwriters
>
0
)
while
(
rwlock
->
rw_refcount
<
0
||
rwlock
->
rw_nwaitwriters
>
0
)
{
{
rwlock
->
rw_nwaitreaders
++
;
rwlock
->
rw_nwaitreaders
++
;
/* rw_mutex will be released when waiting for rw_condreaders */
result
=
pthread_cond_wait
(
&
rwlock
->
rw_condreaders
,
&
rwlock
->
rw_mutex
);
result
=
pthread_cond_wait
(
&
rwlock
->
rw_condreaders
,
&
rwlock
->
rw_mutex
);
/* rw_mutex should have been taken again when returned from waiting */
rwlock
->
rw_nwaitreaders
--
;
rwlock
->
rw_nwaitreaders
--
;
if
(
result
!=
0
)
if
(
result
!=
0
)
/* wait error */
break
;
break
;
}
}
...
@@ -160,7 +162,9 @@ int pthread_rwlock_timedrdlock (pthread_rwlock_t * rwlock, const struct timespec
...
@@ -160,7 +162,9 @@ int pthread_rwlock_timedrdlock (pthread_rwlock_t * rwlock, const struct timespec
while
(
rwlock
->
rw_refcount
<
0
||
rwlock
->
rw_nwaitwriters
>
0
)
while
(
rwlock
->
rw_refcount
<
0
||
rwlock
->
rw_nwaitwriters
>
0
)
{
{
rwlock
->
rw_nwaitreaders
++
;
rwlock
->
rw_nwaitreaders
++
;
/* rw_mutex will be released when waiting for rw_condreaders */
result
=
pthread_cond_timedwait
(
&
rwlock
->
rw_condreaders
,
&
rwlock
->
rw_mutex
,
abstime
);
result
=
pthread_cond_timedwait
(
&
rwlock
->
rw_condreaders
,
&
rwlock
->
rw_mutex
,
abstime
);
/* rw_mutex should have been taken again when returned from waiting */
rwlock
->
rw_nwaitreaders
--
;
rwlock
->
rw_nwaitreaders
--
;
if
(
result
!=
0
)
if
(
result
!=
0
)
break
;
break
;
...
@@ -187,7 +191,9 @@ int pthread_rwlock_timedwrlock (pthread_rwlock_t *rwlock, const struct timespec
...
@@ -187,7 +191,9 @@ int pthread_rwlock_timedwrlock (pthread_rwlock_t *rwlock, const struct timespec
while
(
rwlock
->
rw_refcount
!=
0
)
while
(
rwlock
->
rw_refcount
!=
0
)
{
{
rwlock
->
rw_nwaitwriters
++
;
rwlock
->
rw_nwaitwriters
++
;
/* rw_mutex will be released when waiting for rw_condwriters */
result
=
pthread_cond_timedwait
(
&
rwlock
->
rw_condwriters
,
&
rwlock
->
rw_mutex
,
abstime
);
result
=
pthread_cond_timedwait
(
&
rwlock
->
rw_condwriters
,
&
rwlock
->
rw_mutex
,
abstime
);
/* rw_mutex should have been taken again when returned from waiting */
rwlock
->
rw_nwaitwriters
--
;
rwlock
->
rw_nwaitwriters
--
;
if
(
result
!=
0
)
break
;
if
(
result
!=
0
)
break
;
...
@@ -233,7 +239,7 @@ int pthread_rwlock_unlock (pthread_rwlock_t *rwlock)
...
@@ -233,7 +239,7 @@ int pthread_rwlock_unlock (pthread_rwlock_t *rwlock)
if
(
rwlock
->
rw_refcount
>
0
)
if
(
rwlock
->
rw_refcount
>
0
)
rwlock
->
rw_refcount
--
;
/* releasing a reader */
rwlock
->
rw_refcount
--
;
/* releasing a reader */
else
if
(
rwlock
->
rw_refcount
==
-
1
)
else
if
(
rwlock
->
rw_refcount
==
-
1
)
rwlock
->
rw_refcount
=
0
;
/* releasing a
read
er */
rwlock
->
rw_refcount
=
0
;
/* releasing a
writ
er */
/* give preference to waiting writers over waiting readers */
/* give preference to waiting writers over waiting readers */
if
(
rwlock
->
rw_nwaitwriters
>
0
)
if
(
rwlock
->
rw_nwaitwriters
>
0
)
...
@@ -264,7 +270,9 @@ int pthread_rwlock_wrlock (pthread_rwlock_t *rwlock)
...
@@ -264,7 +270,9 @@ int pthread_rwlock_wrlock (pthread_rwlock_t *rwlock)
while
(
rwlock
->
rw_refcount
!=
0
)
while
(
rwlock
->
rw_refcount
!=
0
)
{
{
rwlock
->
rw_nwaitwriters
++
;
rwlock
->
rw_nwaitwriters
++
;
/* rw_mutex will be released when waiting for rw_condwriters */
result
=
pthread_cond_wait
(
&
rwlock
->
rw_condwriters
,
&
rwlock
->
rw_mutex
);
result
=
pthread_cond_wait
(
&
rwlock
->
rw_condwriters
,
&
rwlock
->
rw_mutex
);
/* rw_mutex should have been taken again when returned from waiting */
rwlock
->
rw_nwaitwriters
--
;
rwlock
->
rw_nwaitwriters
--
;
if
(
result
!=
0
)
break
;
if
(
result
!=
0
)
break
;
...
...
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