flint.h – global definitions¶
Allocation Functions¶
-
void *flint_malloc(size_t size)¶
Allocate
size
bytes of memory.
-
void *flint_realloc(void *ptr, size_t size)¶
Reallocate an area of memory previously allocated by
flint_malloc()
,flint_realloc()
, orflint_calloc()
.
-
void *flint_calloc(size_t num, size_t size)¶
Allocate
num
objects ofsize
bytes each, and zero the allocated memory.
-
void flint_free(void *ptr)¶
Free a section of memory allocated by
flint_malloc()
,flint_realloc()
, orflint_calloc()
.
Random Numbers¶
-
type flint_rand_s¶
A structure holding the state of a flint pseudo random number generator.
-
type flint_rand_t¶
An array of length 1 of
flint_rand_s
.
-
flint_rand_s *flint_rand_alloc()¶
Allocates a
flint_rand_t
object to be used like a heap-allocatedflint_rand_t
in external libraries. The random state is not initialised.
-
void flint_rand_free(flint_rand_s *state)¶
Frees a random state object as allocated using
flint_rand_alloc()
.
-
void flint_randinit(flint_rand_t state)¶
Initialize a
flint_rand_t
.
-
void flint_randclear(flint_rand_t state)¶
Free all memory allocated by
flint_rand_init()
.
Thread functions¶
-
void flint_set_num_threads(int num_threads)¶
Set up a thread pool of
num_threads - 1
worker threads (in addition to the master thread) and set the maximum number of worker threads the master thread can start tonum_threads - 1
.This function may only be called globally from the master thread. It can also be called at a global level to change the size of the thread pool, but an exception is raised if the thread pool is in use (threads have been woken but not given back). The function cannot be called from inside worker threads.
-
void flint_get_num_threads()¶
When called at the global level, this function returns one more than the number of worker threads in the Flint thread pool, i.e. it counts the workers in the thread pool plus one more for the master thread.
In general, this function returns one more than the number of additional worker threads that can be started by the current thread.
Use
thread_pool_wake()
to set this number for a given worker thread.
-
int flint_set_num_workers(int num_workers)¶
Restricts the number of worker threads that can be started by the current thread to
num_workers
. This function can be called from any thread.Assumes that the Flint thread pool is already set up.
The function returns the old number of worker threads that can be started.
The function can only be used to reduce the number of workers that can be started from a thread. It cannot be used to increase the number. If a higher number is passed, the function has no effect.
The number of workers must be restored to the original value by a call to
flint_reset_num_workers()
before the thread is returned to the thread pool.The main use of this function and
flint_reset_num_workers()
is to cheaply and temporarily restrict the number of workers that can be started, e.g. by a function that one wishes to call from a thread, and cheaply restore the number of workers to its original value before exiting the current thread.
-
void flint_reset_num_workers(int num_workers)¶
After a call to
flint_set_num_workers()
this function must be called to set the number of workers that may be started by the current thread back to its original value.
Input/Output¶
-
int flint_printf(const char *str, ...)¶
-
int flint_vprintf(const char *str, va_list ap)¶
-
int flint_fprintf(FILE *f, const char *str, ...)¶
-
int flint_sprintf(char *s, const char *str, ...)¶
These are equivalent to the standard library functions
printf
,vprintf
,fprintf
, andsprintf
with an additional length modifier “w” for use with anmp_limb_t
type. This modifier can be used with format specifiers “d”, “x”, or “u”, thereby outputting the limb as a signed decimal, hexadecimal, or unsigned decimal integer.