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organize std lib concurrency primitives and add RwLock

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* move concurrency primitives that always operate on kernel threads to
   the std.Thread namespace
 * remove std.SpinLock. Nobody should use this in a non-freestanding
   environment; the other primitives are always preferable. In
   freestanding, it will be necessary to put custom spin logic in there,
   so there are no use cases for a std lib version.
 * move some std lib files to the top level fields convention
 * add std.Thread.spinLoopHint
 * add std.Thread.Condition
 * add std.Thread.Semaphore
 * new implementation of std.Thread.Mutex for Windows and non-pthreads Linux
 * add std.Thread.RwLock

Implementations provided by @kprotty
This commit is contained in:
Andrew Kelley
2021-01-14 20:41:37 -07:00
parent 2b0e3ee228
commit a9667b5a85
38 changed files with 1756 additions and 1272 deletions
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26
lib/std/c/linux.zig
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@@ -123,6 +123,32 @@ pub const pthread_mutex_t = extern struct {
pub const pthread_cond_t = extern struct {
size: [__SIZEOF_PTHREAD_COND_T]u8 align(@alignOf(usize)) = [_]u8{0} ** __SIZEOF_PTHREAD_COND_T,
};
pub const pthread_rwlock_t = switch (std.builtin.abi) {
.android => switch (@sizeOf(usize)) {
4 => extern struct {
lock: std.c.pthread_mutex_t = std.c.PTHREAD_MUTEX_INITIALIZER,
cond: std.c.pthread_cond_t = std.c.PTHREAD_COND_INITIALIZER,
numLocks: c_int = 0,
writerThreadId: c_int = 0,
pendingReaders: c_int = 0,
pendingWriters: c_int = 0,
attr: i32 = 0,
__reserved: [12]u8 = [_]u8{0} ** 2,
},
8 => extern struct {
numLocks: c_int = 0,
writerThreadId: c_int = 0,
pendingReaders: c_int = 0,
pendingWriters: c_int = 0,
attr: i32 = 0,
__reserved: [36]u8 = [_]u8{0} ** 36,
},
else => unreachable,
},
else => extern struct {
size: [56]u8 align(@alignOf(usize)) = [_]u8{0} ** 56,
},
};
pub const sem_t = extern struct {
__size: [__SIZEOF_SEM_T]u8 align(@alignOf(usize)),
};