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Mutex-free implementation of pthread_rwlock

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Bug: 8133149
Change-Id: Id6775010d95f2634b173daa55d87a59a3cf4131b
This commit is contained in:
Calin Juravle
2014-05-19 13:41:10 +01:00
parent 9b95ea936a
commit 76f352eec1
3 changed files with 221 additions and 190 deletions
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17
libc/include/pthread.h
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@@ -94,16 +94,17 @@ typedef long pthread_condattr_t;
typedef long pthread_rwlockattr_t;
typedef struct {
pthread_mutex_t lock;
pthread_cond_t cond;
int numLocks;
int writerThreadId;
int pendingReaders;
int pendingWriters;
void* __reserved[4];
pthread_mutex_t __unused_lock;
pthread_cond_t __unused_cond;
volatile int32_t state; // 0=unlock, -1=writer lock, +n=reader lock
volatile int32_t writerThreadId;
volatile int32_t pendingReaders;
volatile int32_t pendingWriters;
int32_t attr;
void* __reserved[3];
} pthread_rwlock_t;
#define PTHREAD_RWLOCK_INITIALIZER { PTHREAD_MUTEX_INITIALIZER, PTHREAD_COND_INITIALIZER, 0, 0, 0, 0, { NULL, NULL, NULL, NULL } }
#define PTHREAD_RWLOCK_INITIALIZER { PTHREAD_MUTEX_INITIALIZER, PTHREAD_COND_INITIALIZER, 0, 0, 0, 0, 0, { NULL, NULL, NULL } }
typedef int pthread_key_t;
typedef long pthread_t;