12-03-2016
You created this thread a few hours ago and I thought that I'd leave it for someone with greater knowledge than me. However, so far, no replies.
So here goes.
As far as I remember, the ESC key to interrupt Grub boot has been deprecated. I think that to interrupt boot on Grub2 you need to hold down a SHIFT key but I can't remember whether it's the left or right SHIFT key (or whether it even matters). Hold a SHIFT key for the whole boot process and see what happens.
Any member reading this and know whether I'm right or wrong please do let me and the OP know because I'm not sure either.
Hope that does help.
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LEARN ABOUT OSX
pthread_key_create
PTHREAD_KEY_CREATE(3) BSD Library Functions Manual PTHREAD_KEY_CREATE(3)
NAME
pthread_key_create -- thread-specific data key creation
SYNOPSIS
#include <pthread.h>
int
pthread_key_create(pthread_key_t *key, void (*destructor)(void *));
DESCRIPTION
The pthread_key_create() function creates a thread-specific data key that is visible to all threads in the process. Key values provided by
pthread_key_create() are opaque objects, used to locate thread-specific data. Although the same key value may be used by different threads,
the values bound to the key by pthread_setspecific() are maintained on a per-thread basis and persist for the life of the calling thread.
Upon key creation, the value NULL is associated with the new key in all active threads. Upon thread creation, the value NULL is associated
with all defined keys in the new thread.
An optional destructor function may be associated with each key value. If a key value has a non-NULL destructor function pointer, and the
thread has a non-NULL value associated with the key at the time of thread exit, then the key value is set to NULL and the destructor function
is called with the previous key value as its argument. The order of destructor calls at thread exit is unspecified.
If, after all the destructors have been called for all non-NULL values with associated destructors, there are still some non-NULL values with
associated destructors, then the process is repeated. If, after at least [PTHREAD_DESTRUCTOR_ITERATIONS] iterations of destructor calls for
outstanding non-NULL values, there are still some non-NULL values with associated destructors, the implementation stops calling destructors.
RETURN VALUES
If successful, the pthread_key_create() function will store the newly created key value at the location specified by key and returns zero.
Otherwise, an error number will be returned to indicate the error.
ERRORS
pthread_key_create() will fail if:
[EAGAIN] The system lacked the necessary resources to create another thread-specific data key, or the system-imposed limit on the
total number of keys per process [PTHREAD_KEYS_MAX] would be exceeded.
[ENOMEM] Insufficient memory exists to create the key.
SEE ALSO
pthread_getspecific(3), pthread_key_delete(3), pthread_setspecific(3)
STANDARDS
pthread_key_create() conforms to ISO/IEC 9945-1:1996 (``POSIX.1'').
BSD
April 4, 1996 BSD