[En-Nut-Discussion] Feature Request 1572837: mutex API nesting level info

[duane ellis]

Bernard Fouché wrote:
> Hi,
>
> FYI, here is the point of view of eCos designers about recursive mutexes 
> (taken from http://ecos.sourceware.org/docs-latest/ref/kernel-mutexes.html):
> ---
>   
POSIX threads solved this along time ago.  POSIX threads lets you many
types of MUTEXes.


    int pthread_mutex_init(pthread_mutex_t *mutex,
		const pthread_mutexattr_t *attr);

Where ATTRIBUTE is one of:
    NULL - you get some default

Or NOT NULL, and was specified via pthread_mutexattr_settype() as one of:

    PTHREAD_MUTEX_NORMAL
    PTHREAD_MUTEX_ERRORCHECK
    PTHREAD_MUTEX_RECURSIVE
    PTHREAD_MUTEX_DEFAULT

See:

http://www.opengroup.org/onlinepubs/007908799/xsh/pthread_mutexattr_settype.html

** Yes, NUT is not Pthreads.

But NUT can certainly learn from - pthreads. It is a well thought out 
solution, that has passed the many eyeballs test.

One can learn from this.

-Duane.