New features

• Benchmark framework.

  :::cpp

  include "co/benchmark.h"

  include "co/mem.h"

  BM_group(malloc) { void* p;

   BM_add(::malloc)(
       p = ::malloc(32);
   );
   BM_use(p);
  
   BM_add(co::alloc)(
       p = co::alloc(32);
   );
   BM_use(p);
  

  }

  int main(int argc, char** argv) { flag::parse(argc, argv); bm::run_benchmarks(); return 0; }

• gen supports generating code for converting JSON to struct, refer to the example test/j2s.

Improvement

• Coroutine scheduling optimization.
• Improve coroutine-related components. co::mutex, co::event, co::chan, etc. can be used in coroutines or non-coroutines, and POD types like std::string can be stored in co::chan.

Others

• Removed Random class, provided co::rand(), co::randstr(), and renamed the header file toco/rand.h`.
• Remove the global Thread and Mutex.
• APIs such as co::*scheduler* are renamed to co::*sched*.
• Other improvements, bug fixes, etc.