Subtotal of process thread coordination

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One 、 process Threads coroutines

A process is a unit of resource allocation ;
Thread is CPU Dispatch unit ;
coroutines , Also called tasklet , fibers ; Coroutine is a lightweight thread in user mode

Two 、 The difference between a process and a thread

1. address space : A thread is an execution unit in a process , There is at least one thread in the process , They share the address space of the process , The process has its own address space
2. Resource ownership : Processes are units of resource allocation and ownership , Threads in the same process share the resources of the process
3. Thread is cpu The basic unit of processor scheduling , But the process is not
4. Both can be executed concurrently
5. Each independent thread has an entry for the program to run 、 Exit of sequential execution sequence and program , But threads can't execute independently , Must exist in the application , Multiple thread execution control provided by the application

3、 ... and The difference between threads and coroutines :

Thread switching will be saved to CPU In my stack , It has its own register context and stack
The main function of a coroutine is to achieve concurrency under the condition of a single thread , But it's actually serial ( image yield equally )

1. A thread can have more than one process , A process can also have multiple collaborations alone .
2. Thread processes are all synchronization mechanisms , And the process is asynchronous .
3. The process can keep the state of the last call , Every time the process reenters , It's equivalent to entering the state of the last call .
   4） Threads are resources of coroutines . The agreement passed Interceptor To use the thread resource indirectly .