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libc: speed-up flockfile()/funlockfile()

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For Honeycomb, we added proper file thread-safety for
all FILE* operations. However, we did implement that by
using an out-of-band hash table to map FILE* pointers
to phtread_mutex_t mutexes, because we couldn't change
the size of 'struct _sFILE' without breaking the ABI.

It turns out that our BSD-derived code already has
some support code to extend FILE* objects, so use it
instead. See libc/stdio/fileext.h

This patch gets rid of the hash table, and put the
mutex directly into the sFILE extension.

Change-Id: If1c3fe0a0a89da49c568e9a7560b7827737ff4d0
This commit is contained in:
David 'Digit' Turner
2011-08-29 21:43:46 +02:00
parent 4b469eae40
commit 9831ad3ce6
4 changed files with 44 additions and 153 deletions
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10
libc/include/pthread.h
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@@ -42,9 +42,13 @@ typedef struct
int volatile value;
} pthread_mutex_t;
#define PTHREAD_MUTEX_INITIALIZER {0}
#define PTHREAD_RECURSIVE_MUTEX_INITIALIZER {0x4000}
#define PTHREAD_ERRORCHECK_MUTEX_INITIALIZER {0x8000}
#define __PTHREAD_MUTEX_INIT_VALUE 0
#define __PTHREAD_RECURSIVE_MUTEX_INIT_VALUE 0x4000
#define __PTHREAD_ERRORCHECK_MUTEX_INIT_VALUE 0x8000
#define PTHREAD_MUTEX_INITIALIZER {__PTHREAD_MUTEX_INIT_VALUE}
#define PTHREAD_RECURSIVE_MUTEX_INITIALIZER {__PTHREAD_RECURSIVE_MUTEX_INIT_VALUE}
#define PTHREAD_ERRORCHECK_MUTEX_INITIALIZER {__PTHREAD_ERRORCHECK_MUTEX_INIT_VALUE}
enum {
PTHREAD_MUTEX_NORMAL = 0,