Refactor some code

- Write tests for cthreads
- Fix bugs in pe2.com tool
- Fix ASAN issue with GetDosEnviron()
- Consolidate the cthread header files
- Some code size optimizations for MODE=
- Attempted to squash a tls linker warning
- Attempted to get futexes working on FreeBSD

libc/thread/thread.h

@@ -0,0 +1,80 @@
+#ifndef COSMOPOLITAN_LIBC_THREAD_THREAD_H_
+#define COSMOPOLITAN_LIBC_THREAD_THREAD_H_
+#include "libc/calls/struct/timespec.h"
+#include "libc/runtime/runtime.h"
+
+#define CTHREAD_CREATE_DETACHED 1
+#define CTHREAD_CREATE_JOINABLE 0
+
+#if !(__ASSEMBLER__ + __LINKER__ + 0)
+COSMOPOLITAN_C_START_
+
+enum cthread_state {
+  cthread_started = 0,
+  cthread_joining = 1,
+  cthread_finished = 2,
+  cthread_detached = 4,
+  cthread_main = 127,
+};
+
+struct cthread_descriptor_t {
+  struct cthread_descriptor_t *self;  /* 0x00 */
+  void *(*func)(void *);              /* 0x08 */
+  int32_t __pad0;                     /* 0x10 */
+  int32_t state;                      /* 0x14 */
+  void *arg;                          /* 0x18 */
+  void *pthread_ret_ptr;              /* 0x20 */
+  int64_t __pad1;                     /* 0x28 */
+  struct cthread_descriptor_t *self2; /* 0x30 */
+  int32_t tid;                        /* 0x38 */
+  int32_t err;                        /* 0x3c */
+  void *exitcode;
+  struct {
+    char *top, *bottom;
+  } stack, alloc;
+  jmp_buf exiter;
+};
+
+typedef struct cthread_descriptor_t *cthread_t;
+
+typedef union cthread_sem_t {
+  struct {
+    uint64_t count;
+  } linux;
+} cthread_sem_t;
+
+typedef struct cthread_attr_t {
+  size_t stacksize, guardsize;
+  int mode;
+} cthread_attr_t;
+
+extern const void *const _main_thread_ctor[];
+
+int cthread_create(cthread_t *, const cthread_attr_t *, void *(*)(void *),
+                   void *);
+
+int cthread_yield(void);
+cthread_t cthread_self(void);
+int cthread_join(cthread_t, void **);
+void cthread_exit(void *) wontreturn;
+int cthread_detach(cthread_t);
+int cthread_attr_init(cthread_attr_t *);
+int cthread_attr_destroy(cthread_attr_t *);
+int cthread_attr_setstacksize(cthread_attr_t *, size_t);
+size_t thread_attr_getstacksize(const cthread_attr_t *);
+int cthread_attr_setguardsize(cthread_attr_t *, size_t);
+size_t cthread_attr_getguardsize(const cthread_attr_t *);
+int cthread_attr_setdetachstate(cthread_attr_t *, int);
+int cthread_attr_getdetachstate(const cthread_attr_t *);
+int cthread_sem_init(cthread_sem_t *, int);
+int cthread_sem_destroy(cthread_sem_t *);
+int cthread_sem_wait(cthread_sem_t *, int, const struct timespec *);
+int cthread_sem_signal(cthread_sem_t *);
+int cthread_memory_wait32(uint32_t *, uint32_t, const struct timespec *);
+int cthread_memory_wake32(uint32_t *, int);
+void cthread_zombies_add(cthread_t);
+void cthread_zombies_reap(void);
+
+COSMOPOLITAN_C_END_
+#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
+#endif /* COSMOPOLITAN_LIBC_THREAD_THREAD_H_ */