这里我们将看到如何使用多线程环境执行矩阵加法和减法。 pthread用于在C或C++中同时执行多个线程。
有两个矩阵A和B。每个矩阵的阶数为(m x n)。每个线程将获取每一行,并执行加法或减法。因此,对于 m 行,有 m 个不同的线程。
示例
#include
#include
#include
#include
#define CORE 3
#define MAX 3
using namespace std;
int AMat[MAX][MAX] = {{10, 20, 30},
{40, 50, 60},
{70, 80, 50}
};
int BMat[MAX][MAX] = {{80, 60, 20},
{30, 20, 15},
{10, 14, 35}
};
pthread_t thread[CORE * 2];
int add[MAX][MAX], sub[MAX][MAX];
void* addMatrices(void* arg) {
intptr_t core = (intptr_t)arg;
// Each thread computes 1/3rd of matrix addition
for (int i = core * MAX / 3; i < (core + 1) * MAX / 3; i++) {
for (int j = 0; j < MAX; j++) {
add[i][j] = AMat[i][j] + BMat[i][j];
}
}
}
void* subtraction(void* arg) {
intptr_t core = (intptr_t)arg;
// Each thread computes 1/3rd of matrix subtraction
for (int i = core * MAX / 3; i < (core + 1) * MAX / 3; i++) {
for (int j = 0; j < MAX; j++) {
sub[i][j] = AMat[i][j] - BMat[i][j];
}
}
}
void display(){
cout