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|
/*
* attr.c
*
* Description:
* This translation unit implements operations on thread attribute objects.
*/
#include <errno.h>
#include <string.h>
#include "pthread.h"
#include "implement.h"
static int
is_attr(const pthread_attr_t *attr)
{
/* Return 0 if the attr object is valid, non-zero otherwise. */
return (attr == NULL ||
*attr == NULL ||
(*attr)->valid != _PTHREAD_ATTR_VALID);
}
int
pthread_attr_setstacksize(pthread_attr_t *attr,
size_t stacksize)
/*
* ------------------------------------------------------
* DOCPUBLIC
* This function specifies the size of the stack on
* which threads created with 'attr' will run.
*
* PARAMETERS
* attr
* pointer to an instance of pthread_attr_t
*
* stacksize
* stack size, in bytes.
*
*
* DESCRIPTION
* This function specifies the size of the stack on
* which threads created with 'attr' will run.
*
* NOTES:
* 1) Function supported only if this macro is
* defined:
*
* _POSIX_THREAD_ATTR_STACKSIZE
*
* 2) Find the default first (using
* pthread_attr_getstacksize), then increase
* by multiplying.
*
* 3) Only use if thread needs more than the
* default.
*
* RESULTS
* 0 successfully set stack size,
* EINVAL 'attr' is invalid or stacksize too
* small or too big.
* ENOSYS function not supported
*
* ------------------------------------------------------
*/
{
#ifdef _POSIX_THREAD_ATTR_STACKSIZE
/* Verify that the stack size is within range. */
if (stacksize < PTHREAD_STACK_MIN)
{
return EINVAL;
}
if (is_attr(attr) != 0)
{
return EINVAL;
}
/* Everything is okay. */
(*attr)->stacksize = stacksize;
return 0;
#else
return ENOSYS;
#endif /* _POSIX_THREAD_ATTR_STACKSIZE */
}
int
pthread_attr_getstacksize(const pthread_attr_t *attr,
size_t *stacksize)
/*
* ------------------------------------------------------
* DOCPUBLIC
* This function determines the size of the stack on
* which threads created with 'attr' will run.
*
* PARAMETERS
* attr
* pointer to an instance of pthread_attr_t
*
* stacksize
* pointer to size_t into which is returned the
* stack size, in bytes.
*
*
* DESCRIPTION
* This function determines the size of the stack on
* which threads created with 'attr' will run.
*
* NOTES:
* 1) Function supported only if this macro is
* defined:
*
* _POSIX_THREAD_ATTR_STACKSIZE
*
* 2) Use on newly created attributes object to
* find the default stack size.
*
* RESULTS
* 0 successfully retrieved stack size,
* EINVAL 'attr' is invalid
* ENOSYS function not supported
*
* ------------------------------------------------------
*/
{
#ifdef _POSIX_THREAD_ATTR_STACKSIZE
if (is_attr(attr) != 0)
{
return EINVAL;
}
/* Everything is okay. */
*stacksize = (*attr)->stacksize;
return 0;
#else
return ENOSYS;
#endif /* _POSIX_THREAD_ATTR_STACKSIZE */
}
int
pthread_attr_setstackaddr(pthread_attr_t *attr,
void *stackaddr)
/*
* ------------------------------------------------------
* DOCPUBLIC
* Threads created with 'attr' will run on the stack
* starting at 'stackaddr'.
* Stack must be at least PTHREAD_STACK_MIN bytes.
*
* PARAMETERS
* attr
* pointer to an instance of pthread_attr_t
*
* stacksize
* stack size, in bytes.
*
*
* DESCRIPTION
* Threads created with 'attr' will run on the stack
* starting at 'stackaddr'.
* Stack must be at least PTHREAD_STACK_MIN bytes.
*
* NOTES:
* 1) Function supported only if this macro is
* defined:
*
* _POSIX_THREAD_ATTR_STACKADDR
*
* 2) Create only one thread for each stack
* address..
*
* 3) Ensure that stackaddr is aligned.
*
* RESULTS
* 0 successfully set stack address,
* EINVAL 'attr' is invalid
* ENOSYS function not supported
*
* ------------------------------------------------------
*/
{
#if defined( _POSIX_THREAD_ATTR_STACKADDR )
if (is_attr(attr) != 0)
{
return EINVAL;
}
(*attr)->stackaddr = stackaddr;
return 0;
#else
return ENOSYS;
#endif /* _POSIX_THREAD_ATTR_STACKADDR */
}
int
pthread_attr_getstackaddr(const pthread_attr_t *attr,
void **stackaddr)
/*
* ------------------------------------------------------
* DOCPUBLIC
* This function determines the address of the stack
* on which threads created with 'attr' will run.
*
* PARAMETERS
* attr
* pointer to an instance of pthread_attr_t
*
* stackaddr
* pointer into which is returned the stack address.
*
*
* DESCRIPTION
* This function determines the address of the stack
* on which threads created with 'attr' will run.
*
* NOTES:
* 1) Function supported only if this macro is
* defined:
*
* _POSIX_THREAD_ATTR_STACKADDR
*
* 2) Create only one thread for each stack
* address..
*
* RESULTS
* 0 successfully retreived stack address,
* EINVAL 'attr' is invalid
* ENOSYS function not supported
*
* ------------------------------------------------------
*/
{
#if defined( _POSIX_THREAD_ATTR_STACKADDR )
if (is_attr(attr) != 0)
{
return EINVAL;
}
*stackaddr = (*attr)->stackaddr;
return 0;
#else
return ENOSYS;
#endif /* _POSIX_THREAD_ATTR_STACKADDR */
}
int
pthread_attr_init(pthread_attr_t *attr)
/*
* ------------------------------------------------------
* DOCPUBLIC
* Initializes a thread attributes object with default
* attributes.
*
* PARAMETERS
* attr
* pointer to an instance of pthread_attr_t
*
*
* DESCRIPTION
* Initializes a thread attributes object with default
* attributes.
*
* NOTES:
* 1) Used to define thread attributes
*
* RESULTS
* 0 successfully initialized attr,
* ENOMEM insufficient memory for attr.
*
* ------------------------------------------------------
*/
{
pthread_attr_t attr_result;
int result = 0;
if (attr == NULL)
{
/* This is disallowed. */
return EINVAL;
}
attr_result = malloc (sizeof (*attr_result));
if (attr_result == NULL)
{
return ENOMEM;
}
#ifdef _POSIX_THREAD_ATTR_STACKSIZE
attr_result->stacksize = PTHREAD_STACK_MIN;
#endif
#ifdef _POSIX_THREAD_ATTR_STACKADDR
/* FIXME: Set this to something sensible when we support it. */
attr_result->stackaddr = NULL;
#endif
attr_result->detachstate = PTHREAD_CREATE_JOINABLE;
#if HAVE_SIGSET_T
memset(&(attr_result->sigmask), 0, sizeof(sigset_t));
#endif /* HAVE_SIGSET_T */
/* Priority uses Win32 priority values. */
attr_result->priority = THREAD_PRIORITY_NORMAL;
attr_result->valid = _PTHREAD_ATTR_VALID;
*attr = attr_result;
return 0;
}
int
pthread_attr_destroy(pthread_attr_t *attr)
/*
* ------------------------------------------------------
* DOCPUBLIC
* Destroys a thread attributes object.
*
* PARAMETERS
* attr
* pointer to an instance of pthread_attr_t
*
*
* DESCRIPTION
* Destroys a thread attributes object.
*
* NOTES:
* 1) Does not affect threads created with 'attr'.
*
* RESULTS
* 0 successfully destroyed attr,
* EINVAL 'attr' is invalid.
*
* ------------------------------------------------------
*/
{
if (is_attr(attr) != 0)
{
return EINVAL;
}
/*
* Set the attribute object to a specific invalid value.
*/
(*attr)->valid = 0;
free (*attr);
*attr = NULL;
return 0;
}
int
pthread_attr_getdetachstate(const pthread_attr_t *attr,
int *detachstate)
/*
* ------------------------------------------------------
* DOCPUBLIC
* This function determines whether threads created with
* 'attr' will run detached.
*
* PARAMETERS
* attr
* pointer to an instance of pthread_attr_t
*
* detachstate
* pointer to an integer into which is returned one
* of:
*
* PTHREAD_CREATE_JOINABLE
* Thread ID is valid, must be joined
*
* PTHREAD_CREATE_DETACHED
* Thread ID is invalid, cannot be joined,
* canceled, or modified
*
*
* DESCRIPTION
* This function determines whether threads created with
* 'attr' will run detached.
*
* NOTES:
* 1) You cannot join or cancel detached threads.
*
* RESULTS
* 0 successfully retrieved detach state,
* EINVAL 'attr' is invalid
*
* ------------------------------------------------------
*/
{
if (is_attr(attr) != 0 || detachstate == NULL)
{
*detachstate = PTHREAD_CREATE_DETACHED;
return EINVAL;
}
*detachstate = (*attr)->detachstate;
return 0;
}
int
pthread_attr_setdetachstate(pthread_attr_t *attr,
int detachstate)
/*
* ------------------------------------------------------
* DOCPUBLIC
* This function specifies whether threads created with
* 'attr' will run detached.
*
* PARAMETERS
* attr
* pointer to an instance of pthread_attr_t
*
* detachstate
* an integer containing one of:
*
* PTHREAD_CREATE_JOINABLE
* Thread ID is valid, must be joined
*
* PTHREAD_CREATE_DETACHED
* Thread ID is invalid, cannot be joined,
* canceled, or modified
*
*
* DESCRIPTION
* This function specifies whether threads created with
* 'attr' will run detached.
*
* NOTES:
* 1) You cannot join or cancel detached threads.
*
* RESULTS
* 0 successfully set detach state,
* EINVAL 'attr' or 'detachstate' is invalid
*
* ------------------------------------------------------
*/
{
if (is_attr(attr) != 0)
{
return EINVAL;
}
if (detachstate != PTHREAD_CREATE_JOINABLE ||
detachstate != PTHREAD_CREATE_DETACHED)
{
return EINVAL;
}
(*attr)->detachstate = detachstate;
return 0;
}
|
