simple Intel TSX example

intel-tsx.c

#include <stdio.h>
#include <immintrin.h>

int main() {
    unsigned int balance = 100;
    unsigned int withdrawal = 50;

    // 开始事务
    if (_xbegin() == _XBEGIN_STARTED) {
        // 在事务中执行操作
        if (balance >= withdrawal) {
            balance -= withdrawal;
            printf("取款成功！余额：%u\n", balance);

            // 提交事务
            _xend();
        } else {
            // 事务中止，回滚操作
            _xabort(0);
        }
    } else {
        // 事务中止，执行备用操作
        balance -= withdrawal;
        printf("取款失败！余额不足，余额：%u\n", balance);
    }

    return 0;
}

intel-tsx.md

Intel TSX

Sample C++ code for using Intel TSX (Transactional Synchronization Extensions) on Linux.

#include <immintrin.h>
#include <iostream>

int main() {
    int lockVar = 0;

    if (__sync_bool_compare_and_swap(&lockVar, 0, 1)) {
        // Critical section
        std::cout << "Transactionally executing\n";
        __sync_lock_release(&lockVar);
    } else {
        // Fallback path
        std::cout << "Transaction aborted, using fallback path\n";
    }
    return 0;
}

Or, using _xbegin and _xend:

#include <immintrin.h>
#include <iostream>

int main() {
    int lockVar = 0;

    if (_xbegin() == _XBEGIN_STARTED) {
        if (lockVar != 0) {
            _xabort(0xff);
        }
        // Critical section
        std::cout << "Transactionally executing\n";
        _xend();
    } else {
        // Fallback path
        std::cout << "Transaction aborted, using fallback path\n";
    }

    return 0;
}

Compile with:

g++ -mrtm -o tsx tsx.c

For more information, see the Intel TSX Programming Guide.