另一方面的原因是单个成员函数的线程安全并不具备可组合性(composable) 假设有safe_vector<T>class,它的接口与std::vector相同,不过每个成员函数都是线程安全的(类似Java synchronized方法)。但是用safe_vector<T>并不一定能写出线程安全的代码。例如,在if语句判断vec非空之后,别的
#include <iostream> #include <mutex> #include <thread> #include <vector> // 共享数据 int sharedCounter = 0; // 互斥锁 std::mutex mtx; // 对共享数据的访问操作 void incrementCounter() { std::lock_guard<std::mutex> lock(mtx); // 使用互斥锁保护代码块 // 以下操作在互斥锁保护下是安全...
<iostream> int g_i = 0; std::mutex g_i_mutex; // protects g_i,用来保护g_i void safe_increment() { const std::lock_guard<std::mutex> lock(g_i_mutex); ++g_i; std::cout << std::this_thread::get_id() << ": " << g_i << '\n';// g_i_mutex自动解锁}int main(){...
Compiler warning (level 3, off) C4640 'instance': construction of local static object is not thread-safe Compiler warning (level 3) C4641 XML document comment has an ambiguous cross reference: Compiler warning (level 1) C4642 'class': could not import the constraints for generic parameter '...
When an application is built with this macro defined, standard library routines used with string objects are thread safe. Ensuring thread safety of stream objects All classes declared in the iostream standard library are reentrant, and use a single lock to ensure thread-safety while preventing dead...
{int h2_idx_in_k_dim_B = threadIdx.x % NUM_H2_ELEMENTS_IN_K_DIM;int shmem_k_start_for_h2_B = h2_idx_in_k_dim_B * VECTOR_SIZE_H2;int k_global_B_0 = k_tile_start_prologue + shmem_k_start_for_h2_B;int k_global_B_1 = k_tile_start_prologue + shmem_k_start_for_h2...
断言,是宏,而非函数。assert 宏的原型定义在<assert.h>(C)、<cassert>(C++)中,其作用是如果它的条件返回错误,则终止程序执行。可以通过定义NDEBUG来关闭 assert,但是需要在源代码的开头,include <assert.h>之前。 使用 代码语言:javascript 代码运行次数:0 ...
已更改 threadlocaleinfostruct 结构以适应区域设置函数的更改。 具有相应内部函数(如 memxxx()、strxxx())的 CRT 函数,已从 intrin.h 删除。 如果以前仅对这些函数包含 intrin.h,则现在必须包含相应的 CRT 标头。MFC 和 ATL删除了 Fusion 支持 (afxcomctl32.h),因此,已删除 <afxcomctl32.h> 中定义的所有...
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dim_B = threadIdx.x % NUM_H2_ELEMENTS_IN_K_DIM; int shmem_k_start_for_h2_B = h2_idx_in_k_dim_B * VECTOR_SIZE_H2; int k_global_B_0 = k_tile_start_prologue + shmem_k_start_for_h2_B; int k_global_B_1 = k_tile_start_prologue + shmem_k_start_for_h2_B + 1; int ...