c++ - 为什么这个 openmp 给 SIGSEGV？

Question

代码在不使用 openmp 的情况下工作正常。我已经使用了 private 和 shared 但它仍然在定义我的结构 SinRes 的行上给出 SIGSEGV。

#pragma omp parallel for private(row, dt1, dt1s, dtmp, dat1, atur) shared(turVec)
for(row=0; row<ndicts; ++row)
{ 
     dt1 = kI(keys)[row]; 
     dt1s = to_string(dj(dt1));
     dtmp = dt1s.substr(0, 4) + "." + dt1s.substr(4, 2) + "." + dt1s.substr(6, 2);
     dat1 = kK(data)[row];
     dat1s = kK(dat1->k)[1];
     atur =  breakLogic(dat1s, mpar, dtmp);
     ///free(atur);
     turVec.push_back(atur);
 }

错误信息是

(gdb) run 5 x5.csv
Starting program: /root/cwork/ompTur 5 x5.csv
warning: no loadable sections found in added symbol-file system-supplied DSO at    0x2aaaaaacd000
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[New Thread 0x2aaaac2e1700 (LWP 17500)]
[New Thread 0x2aaaac4e2700 (LWP 17501)]
[New Thread 0x2aaaac6e3700 (LWP 17502)]
[New Thread 0x2aaaad1e9700 (LWP 17503)]
[New Thread 0x2aaaad3ea700 (LWP 17504)]
[New Thread 0x2aaaad5eb700 (LWP 17505)]
[New Thread 0x2aaaad7ec700 (LWP 17506)]

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x2aaaad7ec700 (LWP 17506)]
0x0000000000407a7a in sinRes::sinRes (this=0x2aaab401f430) at ompTur.cpp:33
33      struct sinRes {
(gdb)

我是 openmp 的新手。我是否需要使用任何其他构造，例如 critical？

SinRes 的代码很简单

struct sinRes {
    double pnl, numTrds, firstVar;
    string dt;
};

Answer 1

标准 C++ 容器类在写入操作方面不是线程安全的。必须使用显式同步访问，例如:

#pragma omp critical
turVec.push_back(atur);

operator[] 不会在必要时扩展 vector 对象的内部存储，因此允许并发访问。