It's been thirteen years and C++ still hasn't implemented this wonderful
simple builtin keyword. In C++23 a solution was provided for making this
work in C++ which is libcxx's stdatomic.h. Including that header schleps
in literally 253 unique header files!! Many of the header files it needs
are libc header files like pthread.h where we need to have the _Atomic()
keyword, but since <atomic> depends on pthreads we can't have it include
the <stdatomic.h> header that defines _Atomic for C++ users, and instead
we simply make the type non-atomic, hoping and praying only C code shall
use those internal data structures. This just shows how STL clowns can't
be trusted to define the innermost primitives of a language. They should
instead be focusing on being the best at algorithms and data structures.
- NetBSD should now have faster synchronization
- POSIX barriers may now be shared across processes
- An edge case with memory map tracking has been fixed
- Grand Central Dispatch is no longer used on MacOS ARM64
- POSIX mutexes in normal mode now use futexes across processes
- CLOCK_THREAD_CPUTIME_ID
- CLOCK_PROCESS_CPUTIME_ID
Cosmo now supports the above constants universally across supported OSes
therefore it's now safe to let programs detect their presence w/ #ifdefs
Cosmopolitan Libc once called this important function although somewhere
along the way, possibly in a refactoring, it got removed and __tls_alloc
has always been zero ever since.
The memory leak detector was crashing. When using gc() you shouldn't use
the CheckForMemoryLeaks() function from inside the same function, due to
how it runs the atexit handlers.
Cosmopolitan now supports mremap(), which is only supported on Linux and
NetBSD. First, it allows memory mappings to be relocated without copying
them; this can dramatically speed up data structures like std::vector if
the array size grows larger than 256kb. The mremap() system call is also
10x faster than munmap() when shrinking large memory mappings.
There's now two functions, getpagesize() and getgransize() which help to
write portable code that uses mmap(MAP_FIXED). Alternative sysconf() may
be called with our new _SC_GRANSIZE. The madvise() system call now has a
better wrapper with improved documentation.
