Elevate Windows production worthiness

- SQLite file locking now works on Windows
- SQLite will now use fdatasync() on non-Apple platforms
- Fix Ctrl-C handler on Windows to not crash with TLS
- Signals now work in multithreaded apps on Windows
- fcntl() will now accurately report EINVAL errors
- fcntl() now has excellent --strace logging
- Token bucket replenish now go 100x faster
- *NSYNC cancellations now work on Windows
- Support closefrom() on NetBSD

libc/thread/mktls.c

@@ -19,6 +19,7 @@
 #include "libc/dce.h"
 #include "libc/intrin/asan.internal.h"
 #include "libc/intrin/asancodes.h"
+#include "libc/intrin/atomic.h"
 #include "libc/macros.internal.h"
 #include "libc/mem/mem.h"
 #include "libc/runtime/internal.h"
@@ -57,7 +58,8 @@ char *_mktls(struct CosmoTib **out_tib) {
   tib = (struct CosmoTib *)(tls + I(_tls_size));
   tib->tib_self = tib;
   tib->tib_self2 = tib;
-  tib->tib_tid = -1;
+  tib->tib_sigmask = __get_tls()->tib_sigmask;
+  atomic_store_explicit(&tib->tib_tid, -1, memory_order_relaxed);
 
   if (out_tib) {
     *out_tib = tib;

libc/thread/tls.h

@@ -26,7 +26,7 @@ struct CosmoTib {
   int32_t tib_errno;             /* 0x3c */
   void *tib_nsync;
   uint64_t tib_flags;
-  void *tib_reserved2;
+  uint64_t tib_sigmask;
   void *tib_reserved3;
   void *tib_reserved4;
   void *tib_reserved5;

libc/thread/tls2.h

@@ -4,8 +4,8 @@
 #include "libc/thread/tls.h"
 #if !(__ASSEMBLER__ + __LINKER__ + 0)
 COSMOPOLITAN_C_START_
-
 #if defined(__GNUC__) && defined(__x86_64__) && !defined(__STRICT_ANSI__)
+
 /**
  * Returns location of thread information block.
  *
@@ -24,8 +24,19 @@ static noasan inline struct CosmoTib *__get_tls_privileged(void) {
   }
   return (struct CosmoTib *)tib;
 }
-#endif /* GNU x86-64 */
 
+static noasan inline struct CosmoTib *__get_tls_win32(void) {
+  char *tib, *lin = (char *)0x30;
+  asm("mov\t%%gs:(%1),%0" : "=a"(tib) : "r"(lin) : "memory");
+  tib = *(char **)(tib + 0x1480 + __tls_index * 8);
+  return (struct CosmoTib *)tib;
+}
+
+static noasan inline void __set_tls_win32(void *tls) {
+  asm("mov\t%1,%%gs:%0" : "=m"(*((long *)0x1480 + __tls_index)) : "r"(tls));
+}
+
+#endif /* GNU x86-64 */
 COSMOPOLITAN_C_END_
 #endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
 #endif /* COSMOPOLITAN_LIBC_THREAD_TLS2_H_ */