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Threads have the inherent advantage of data sharing over processes. As shown in the following figure, threads share all the memory areas of the process except the stack area, as shown below:

But this kind of sharing sometimes brings problems. Simply consider the following C++ code:

Click (here) to collapse or open

{

Int b = 0

B = a

A = bread1

Return * this

}

It's the critical area code.

They will be described later, and here we are simple and practical static mutexes to solve this problem.

Click (here) to collapse or open

/ / Atomic operation locking

Pthread_mutex_lock & mtx)

+ + test

Pthread_mutex_unlock & mtx)

/ / Atomic operation unlock

Cout Created Time: Mon 15 May 2017 12:01:33 AM CST

* * /

# include

# include

# include

# define MAXOUT 1000000

Using namespace std

Static pthread_mutex_t mtx=PTHREAD_MUTEX_INITIALIZER

Class testc

{

Private:

Int a

Public:

Testc ()

{

A = 1

}

Testc& operator++ ()

{

Int b = 0

B = a

A = bread1

Return * this

}

Void prit ()

{

Cout

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