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156 | #include <assert.h>
#include <stdlib.h>
#include <pthread.h>
#include "array.h"
typedef struct array
{
void** elements;
size_t capacity;
size_t count;
pthread_mutex_t mutex;
} array_t;
// Private declarations
size_t array_find_first_private(array_t* array, const void* element, size_t start_pos);
array_t* array_create(size_t capacity)
{
assert(capacity);
array_t* array = calloc(1, sizeof(array_t));
if ( array == NULL )
return NULL;
array->capacity = capacity;
array->count = 0;
pthread_mutex_init( &array->mutex, NULL );
array->elements = (void**)malloc( capacity * sizeof(void*) );
if ( array->elements == NULL )
return (void)free(array), NULL;
return array;
}
void array_destroy(array_t* array)
{
assert(array);
pthread_mutex_destroy(&array->mutex);
free(array->elements);
free(array);
}
int array_increase_capacity(array_t* array)
{
assert(array);
size_t new_capacity = 10 * array->capacity;
void** new_elements = (void**)realloc( array->elements, new_capacity * sizeof(void*) );
if ( new_elements == NULL )
return -1;
array->capacity = new_capacity;
array->elements = new_elements;
return 0; // Success
}
int array_decrease_capacity(array_t* array)
{
assert(array);
size_t new_capacity = array->capacity / 10;
if ( new_capacity < 10 )
return 0;
void** new_elements = (void**)realloc( array->elements, new_capacity * sizeof(void*) );
if ( new_elements == NULL )
return -1;
array->capacity = new_capacity;
array->elements = new_elements;
return 0; // Success
}
size_t array_get_count(array_t* array)
{
assert(array);
pthread_mutex_lock( &array->mutex );
size_t result = array->count;
pthread_mutex_unlock( &array->mutex );
return result;
}
void* array_get_element(array_t* array, size_t index)
{
assert(array);
assert( index < array_get_count(array) );
pthread_mutex_lock( &array->mutex );
void* result = array->elements[index];
pthread_mutex_unlock( &array->mutex );
return result;
}
int array_append(array_t* array, void* element)
{
assert(array);
pthread_mutex_lock( &array->mutex );
if ( array->count == array->capacity )
if ( array_increase_capacity(array) )
return (void)pthread_mutex_unlock( &array->mutex ), -1;
assert( array->count < array->capacity );
array->elements[array->count++] = element;
pthread_mutex_unlock( &array->mutex );
return 0; // Success
}
size_t array_find_first(array_t* array, const void* element, size_t start_pos)
{
assert( array );
pthread_mutex_lock( &array->mutex );
size_t result = array_find_first_private(array, element, start_pos);
pthread_mutex_unlock( &array->mutex );
return result;
}
size_t array_find_first_private(array_t* array, const void* element, size_t start_pos)
{
assert( array );
for ( size_t index = start_pos; index < array->count; ++index )
if ( array->elements[index] == element )
return index;
return array_not_found;
}
int array_remove_first(array_t* array, const void* element, size_t start_pos)
{
assert( array );
pthread_mutex_lock( &array->mutex );
size_t index = array_find_first_private(array, element, start_pos);
if ( index == array_not_found )
return (void)pthread_mutex_unlock( &array->mutex ), -1;
for ( --array->count; index < array->count; ++index )
array->elements[index] = array->elements[index + 1];
if ( array->count == array->capacity / 10 )
array_decrease_capacity(array);
pthread_mutex_unlock( &array->mutex );
return 0; // Removed
}
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