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plibsys/src/pcondvariable-os2.c at master · Kernal-GH/plibsys · GitHub
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pcondvariable-os2.c
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/*
* The MIT License
*
* Copyright (C) 2017 Alexander Saprykin <saprykin.spb@gmail.com>
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* 'Software'), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include
"patomic.h"
#include
"pmem.h"
#include
"pcondvariable.h"
#include
<stdlib.h>
#define
INCL_DOSSEMAPHORES
#define
INCL_DOSERRORS
#include
<os2.h>
struct
PCondVariable_
{
HEV
waiters_sema
;
pint
waiters_count
;
pint
signaled
;
};
P_LIB_API
PCondVariable
*
p_cond_variable_new
(
void
)
{
PCondVariable
*
ret
;
if
(
P_UNLIKELY
((
ret
=
p_malloc0
(
sizeof
(
PCondVariable
)))
==
NULL
)) {
P_ERROR
(
"PCondVariable::p_cond_variable_new: failed to allocate memory"
);
return
NULL
;
}
if
(
P_UNLIKELY
(
DosCreateEventSem
(
NULL
,
(
PHEV
)
&
ret
->
waiters_sema
,
0
,
FALSE)
!=
NO_ERROR
)) {
P_ERROR
(
"PCondVariable::p_cond_variable_new: failed to initialize"
);
p_free
(
ret
);
return
NULL
;
}
return
ret
;
}
P_LIB_API
void
p_cond_variable_free
(
PCondVariable
*
cond
)
{
if
(
P_UNLIKELY
(
cond
==
NULL
))
return
;
if
(
P_UNLIKELY
(
DosCloseEventSem
(
cond
->
waiters_sema
)
!=
NO_ERROR
))
P_WARNING
(
"PCondVariable::p_cond_variable_free: DosCloseEventSem() failed"
);
p_free
(
cond
);
}
P_LIB_API
pboolean
p_cond_variable_wait
(
PCondVariable
*
cond
,
PMutex
*
mutex
)
{
APIRET
ulrc
;
APIRET
reset_ulrc
;
if
(
P_UNLIKELY
(
cond
==
NULL
||
mutex
==
NULL
))
return
FALSE;
do
{
p_atomic_int_inc
(
&
cond
->
waiters_count
);
p_mutex_unlock
(
mutex
);
do
{
ULONG
post_count
;
ulrc
=
DosWaitEventSem
(
cond
->
waiters_sema
,
SEM_INDEFINITE_WAIT
);
if
(
ulrc
==
NO_ERROR
) {
reset_ulrc
=
DosResetEventSem
(
cond
->
waiters_sema
,
&
post_count
);
if
(
P_UNLIKELY
(
reset_ulrc
!=
NO_ERROR
&&
reset_ulrc
!=
ERROR_ALREADY_RESET
))
P_WARNING
(
"PCondVariable::p_cond_variable_wait: DosResetEventSem() failed"
);
}
}
while
(
ulrc
==
NO_ERROR
&&
p_atomic_int_compare_and_exchange
(
&
cond
->
signaled
,
1
,
0
)
==
FALSE);
p_atomic_int_add
(
&
cond
->
waiters_count
,
-1
);
p_mutex_lock
(
mutex
);
}
while
(
ulrc
==
ERROR_INTERRUPT
);
return
(
ulrc
==
NO_ERROR
) ? TRUE : FALSE;
}
P_LIB_API
pboolean
p_cond_variable_signal
(
PCondVariable
*
cond
)
{
pboolean
result
=
TRUE;
if
(
P_UNLIKELY
(
cond
==
NULL
))
return
FALSE;
if
(
p_atomic_int_get
(
&
cond
->
waiters_count
)
>
0
) {
ULONG
post_count
;
APIRET
ulrc
;
p_atomic_int_set
(
&
cond
->
signaled
,
1
);
ulrc
=
DosPostEventSem
(
cond
->
waiters_sema
);
if
(
P_UNLIKELY
(
ulrc
!=
NO_ERROR
&&
ulrc
!=
ERROR_ALREADY_POSTED
&&
ulrc
!=
ERROR_TOO_MANY_POSTS
)) {
P_WARNING
(
"PCondVariable::p_cond_variable_signal: DosPostEventSem() failed"
);
result
=
FALSE;
}
}
return
result
;
}
P_LIB_API
pboolean
p_cond_variable_broadcast
(
PCondVariable
*
cond
)
{
if
(
P_UNLIKELY
(
cond
==
NULL
))
return
FALSE;
pboolean
result
=
TRUE;
while
(
p_atomic_int_get
(
&
cond
->
waiters_count
)
!=
0
) {
if
(
P_UNLIKELY
(
p_cond_variable_signal
(
cond
)
==
FALSE))
result
=
FALSE;
}
return
result
;
}
void
p_cond_variable_init
(
void
)
{
}
void
p_cond_variable_shutdown
(
void
)
{
}
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