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videolan
vlc-gpu
Commits
4213a133
Commit
4213a133
authored
Apr 11, 2010
by
Rémi Denis-Courmont
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Work-around non-thread-safe use of the C random number generator
parent
4e1ff3a1
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bin/override.c
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4213a133
...
...
@@ -41,6 +41,7 @@ void vlc_enable_override (void)
#include <stdio.h>
#include <stdlib.h>
#include <dlfcn.h>
#include <pthread.h>
static
void
vlogbug
(
const
char
*
level
,
const
char
*
func
,
const
char
*
fmt
,
va_list
ap
)
...
...
@@ -116,4 +117,34 @@ int unsetenv (const char *name)
}
/*** Pseudo random numbers ***
*
* The C PRNG is not thread-safe (and generally sucks, the POSIX 48-bits PRNG
* is much better as a reproducible non-secure PRNG). To work around this, we
* force evil callers to serialize. This makes the call safe, but fails to
* preserve reproducibility of the number sequence (which usually does not
* matter).
**/
static
pthread_mutex_t
prng_lock
=
PTHREAD_MUTEX_INITIALIZER
;
void
srand
(
unsigned
int
seed
)
{
pthread_mutex_lock
(
&
prng_lock
);
LOG
(
"Warning"
,
"%d"
,
seed
);
CALL
(
srand
,
seed
);
pthread_mutex_unlock
(
&
prng_lock
);
}
int
rand
(
void
)
{
int
ret
;
pthread_mutex_lock
(
&
prng_lock
);
LOG
(
"Warning"
,
""
);
ret
=
CALL
(
rand
);
pthread_mutex_unlock
(
&
prng_lock
);
return
ret
;
}
#endif
/* __ELF__ */
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