MUTEX_LOCK(9) Mutex API reference MUTEX_LOCK(9)NAME
mutex_lock - acquire the mutex
SYNOPSIS
void __sched mutex_lock(struct mutex * lock);
ARGUMENTS
lock
the mutex to be acquired
DESCRIPTION
Lock the mutex exclusively for this task. If the mutex is not available right now, it will sleep until it can get it.
The mutex must later on be released by the same task that acquired it. Recursive locking is not allowed. The task may not exit without
first unlocking the mutex. Also, kernel memory where the mutex resides mutex must not be freed with the mutex still locked. The mutex must
first be initialized (or statically defined) before it can be locked. memset-ing the mutex to 0 is not allowed.
( The CONFIG_DEBUG_MUTEXES .config option turns on debugging checks that will enforce the restrictions and will also do deadlock debugging.
)
This function is similar to (but not equivalent to) down.
AUTHOR
Rusty Russell <rusty@rustcorp.com.au>
Author.
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 MUTEX_LOCK(9)
Hi, I have two tasks 'Read' and 'Write' which reads and writes on a file "abc.txt" respectively.
Now I need to restrict the Write operation on the file while Read is going on, But can allow two Reads at a time.
ie. two Reads can happen simultaneously, but Write can't happen at Read is going on.
... (3 Replies)
I have been wondering what the difference between pthread_rwlock_lock and pthread_mutex_lock is. Both these routines acquire an exclusive rw lock on an enclosed region.
So I performed a simple experiment in which I execute both these routines multiple times in a loop. Here are the results:... (1 Reply)
Executive summary:
Code (posted below) cores in AIX 5.3, despite being compiled and run successfully on several other operating systems. Code is attempting to verify that pthread_mutex_lock can be successfully aborted by siglongjmp. I do not believe this is an unreasonable requirement.
If... (1 Reply)
Hi all,
I have a scenario where I need to use the mutex locks. The mutex locks are working fine, but sometimes I am getting into the dead lock situation.
Below is the summary of my code :
MUTEX LOCK
performTask();
MUTEX UNLOCK.
In some cases I get into the situation where... (2 Replies)
Using pthreads is there a way to determine how many threads are waiting on a locked resource? I mean, once a shared resource is protected using e.g. pthread_rwlock_t or pthread_mutex_t one thread grabs the lock and other threads will go to sleep waiting for the resource to be available again. Is... (0 Replies)
I have a program which has 7-8 threads, and lots of shared variables; these variables (and also they may not the primitive type, they may be enum or struct ), then they may read/write by different threads at the same time.
Now, my design is like this,
typedef unsigned short int UINT16;... (14 Replies)