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process
Do not share any state
Are scheduled by the operating system
There are separate memory space (context switch time of the need to preserve the stack, cpu registers, virtual memory, and handle the relevant information such as open, large overhead)
Communication is achieved mainly through the signal transmission mode (there are numerous ways to achieve, semaphores, pipes, events, communication needs through the kernel, inefficient)
Thread
Shared variable (solve the problem of communication trouble, but for accessing variables need to lock)
Are scheduled by the operating system
A process can have multiple threads, each share of resources of the parent process (the overhead of creating a thread occupies much smaller than the process, the number that can be created will be much)
In addition to the way communication between processes can be used for communication, but also can communicate by way of shared memory (via shared memory communication much faster than through the kernel)
Thread using the system will bring an additional burden of context switching.
Coroutine
Fully controlled by a user scheduling
A thread (process) can have multiple coroutines
Each thread (process) cycle completed in accordance with the order of the list of the tasks assigned different tasks (when the task is blocked, the next task; when restored, then come back to perform this task; context switching between tasks only need to save the task, no kernel overhead, can be unlocked access global variables)
Coroutine need to ensure that non-clogging and do not depend
Coroutine not substantially synchronous communication, the use of asynchronous message communication, more efficient
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