diff --git a/src/struct_info_internal.json b/src/struct_info_internal.json
index 4681b77fe55a0..de28e7a0b6c4c 100644
--- a/src/struct_info_internal.json
+++ b/src/struct_info_internal.json
@@ -15,9 +15,9 @@
               "_a_transferredcanvases"
             ],
             "thread_profiler_block": [
-                "threadStatus",
-                "timeSpentInStatus",
-                "name"
+              "threadStatus",
+              "timeSpentInStatus",
+              "name"
             ]
         }
     },
diff --git a/system/lib/libc/musl/src/thread/__timedwait.c b/system/lib/libc/musl/src/thread/__timedwait.c
index 9e3ccc9849257..2c82d2ab1e8c0 100644
--- a/system/lib/libc/musl/src/thread/__timedwait.c
+++ b/system/lib/libc/musl/src/thread/__timedwait.c
@@ -2,13 +2,11 @@
 #include <time.h>
 #include <errno.h>
 #ifdef __EMSCRIPTEN__
-#include <math.h>
-#include <emscripten/threading.h>
-#include <emscripten/emscripten.h>
+#include <math.h> // for INFINITY
 #else
 #include "futex.h"
-#endif
 #include "syscall.h"
+#endif
 #include "pthread_impl.h"
 
 #ifndef __EMSCRIPTEN__
diff --git a/system/lib/libc/musl/src/thread/__wait.c b/system/lib/libc/musl/src/thread/__wait.c
index 66a140bd69401..fe3b5cf38b071 100644
--- a/system/lib/libc/musl/src/thread/__wait.c
+++ b/system/lib/libc/musl/src/thread/__wait.c
@@ -1,6 +1,5 @@
 #ifdef __EMSCRIPTEN__
-#include <math.h>
-#include <emscripten/threading.h>
+#include <math.h> // for INFINITY
 #endif
 
 #include "pthread_impl.h"
diff --git a/system/lib/libc/musl/src/thread/pthread_barrier_wait.c b/system/lib/libc/musl/src/thread/pthread_barrier_wait.c
index 37aebd0f1de3f..37180c8e5a8ad 100644
--- a/system/lib/libc/musl/src/thread/pthread_barrier_wait.c
+++ b/system/lib/libc/musl/src/thread/pthread_barrier_wait.c
@@ -1,6 +1,6 @@
 #ifdef __EMSCRIPTEN__
-#include <assert.h> // For INFINITY
-#include <math.h> // For INFINITY
+#include <assert.h> // for assert
+#include <math.h> // for INFINITY
 #endif
 
 #include "pthread_impl.h"
diff --git a/system/lib/libc/musl/src/thread/pthread_detach.c b/system/lib/libc/musl/src/thread/pthread_detach.c
index c25882cca4ac1..2b516e232db06 100644
--- a/system/lib/libc/musl/src/thread/pthread_detach.c
+++ b/system/lib/libc/musl/src/thread/pthread_detach.c
@@ -32,5 +32,6 @@ static int __pthread_detach(pthread_t t)
 
 weak_alias(__pthread_detach, pthread_detach);
 weak_alias(__pthread_detach, thrd_detach);
-// XXX EMSCRIPTEN: add extra alias for asan.
+#ifdef __EMSCRIPTEN__ // XXX Emscripten add an extra alias for ASan/LSan.
 weak_alias(__pthread_detach, emscripten_builtin_pthread_detach);
+#endif
diff --git a/system/lib/libc/musl/src/thread/pthread_key_create.c b/system/lib/libc/musl/src/thread/pthread_key_create.c
index f45553919647a..39770c7a3c829 100644
--- a/system/lib/libc/musl/src/thread/pthread_key_create.c
+++ b/system/lib/libc/musl/src/thread/pthread_key_create.c
@@ -1,10 +1,6 @@
 #include "pthread_impl.h"
 #include "fork_impl.h"
 
-#ifdef __EMSCRIPTEN__
-#include <emscripten.h>
-#endif
-
 volatile size_t __pthread_tsd_size = sizeof(void *) * PTHREAD_KEYS_MAX;
 void *__pthread_tsd_main[PTHREAD_KEYS_MAX] = { 0 };
 
diff --git a/system/lib/libc/musl/src/thread/thrd_create.c b/system/lib/libc/musl/src/thread/thrd_create.c
index ca4efb661973b..d1191660a292d 100644
--- a/system/lib/libc/musl/src/thread/thrd_create.c
+++ b/system/lib/libc/musl/src/thread/thrd_create.c
@@ -6,8 +6,6 @@
 // if we call the internal __pthread_create function here to don't the wrapping
 // See pthread_create wrapper in compiler-rt/lib/lsan/lsan_interceptors.cpp.
 #define __pthread_create pthread_create
-#else
-int __pthread_create(pthread_t *restrict, const pthread_attr_t *restrict, void *(*)(void *), void *restrict);
 #endif
 
 int thrd_create(thrd_t *thr, thrd_start_t func, void *arg)
diff --git a/system/lib/pthread/library_pthread.c b/system/lib/pthread/library_pthread.c
index 0a47e1a4dd863..b8a48cb91f1c9 100644
--- a/system/lib/pthread/library_pthread.c
+++ b/system/lib/pthread/library_pthread.c
@@ -5,27 +5,13 @@
  * found in the LICENSE file.
  */
 
-#define _GNU_SOURCE
-#include "../internal/libc.h"
-#include "../internal/pthread_impl.h"
+#include "libc.h"
+#include "pthread_impl.h"
 #include <assert.h>
-#include <dirent.h>
-#include <errno.h>
-#include <fcntl.h>
-#include <poll.h>
 #include <pthread.h>
 #include <stdarg.h>
-#include <stdlib.h>
-#include <sys/ioctl.h>
-#include <sys/mman.h>
-#include <sys/socket.h>
-#include <sys/stat.h>
-#include <sys/statvfs.h>
-#include <sys/time.h>
-#include <termios.h>
 #include <threads.h>
 #include <unistd.h>
-#include <utime.h>
 
 #include <emscripten.h>
 #include <emscripten/proxying.h>
@@ -136,6 +122,7 @@ void _emscripten_init_main_thread(void) {
   // pthread struct prev and next should initially point to itself (see __init_tp),
   // this is used by pthread_key_delete for deleting thread-specific data.
   __main_pthread.next = __main_pthread.prev = &__main_pthread;
+  // Initialize thread-specific data area.
   __main_pthread.tsd = (void **)__pthread_tsd_main;
 
   _emscripten_init_main_thread_js(&__main_pthread);
diff --git a/system/lib/pthread/pthread_create.c b/system/lib/pthread/pthread_create.c
index 00df6ad4b8854..5fe3d9bdd90f7 100644
--- a/system/lib/pthread/pthread_create.c
+++ b/system/lib/pthread/pthread_create.c
@@ -5,7 +5,6 @@
  * found in the LICENSE file.
  */
 
-#define _GNU_SOURCE
 #include "pthread_impl.h"
 #include "stdio_impl.h"
 #include "assert.h"
@@ -108,7 +107,7 @@ int __pthread_create(pthread_t* restrict res,
                      void* (*entry)(void*),
                      void* restrict arg) {
   // Note on LSAN: lsan intercepts/wraps calls to pthread_create so any
-  // allocation we do here should be considered leaks.
+  // allocations we do here should not be considered leaks.
   // See: lsan_interceptors.cpp.
   if (!res) {
     return EINVAL;
@@ -292,10 +291,10 @@ void _emscripten_thread_free_data(pthread_t t) {
 }
 
 void _emscripten_thread_exit(void* result) {
-  struct pthread *self = __pthread_self();
+  pthread_t self = __pthread_self();
   assert(self);
 
-  self->canceldisable = PTHREAD_CANCEL_DISABLE;
+  self->canceldisable = 1;
   self->cancelasync = 0;
   self->result = result;
 
@@ -344,8 +343,8 @@ void _emscripten_thread_exit(void* result) {
   // Not hosting a pthread anymore in this worker set __pthread_self to NULL
   __set_thread_state(NULL, 0, 0, 1);
 
-  /* This atomic potentially competes with a concurrent pthread_detach
-   * call; the loser is responsible for freeing thread resources. */
+  // This atomic potentially competes with a concurrent pthread_detach
+  // call; the loser is responsible for freeing thread resources.
   int state = a_cas(&self->detach_state, DT_JOINABLE, DT_EXITING);
 
   if (state == DT_DETACHED) {
@@ -363,7 +362,7 @@ void _emscripten_thread_exit(void* result) {
   }
 }
 
-// Mark as `no_sanitize("address"` since emscripten_pthread_exit destroys
+// Mark as `no_sanitize("address")` since emscripten_pthread_exit destroys
 // the current thread and runs its exit handlers.  Without this asan injects
 // a call to __asan_handle_no_return before emscripten_unwind_to_js_event_loop
 // which seem to cause a crash later down the line.
diff --git a/system/lib/pthread/threading_internal.h b/system/lib/pthread/threading_internal.h
index b4474dea206d2..7803603ccedfa 100644
--- a/system/lib/pthread/threading_internal.h
+++ b/system/lib/pthread/threading_internal.h
@@ -105,7 +105,7 @@ void emscripten_conditional_set_current_thread_status(EM_THREAD_STATUS expectedS
 #endif
 
 int __pthread_kill_js(pthread_t t, int sig);
-int __pthread_create_js(struct __pthread *thread, const pthread_attr_t *attr, void *(*start_routine) (void *), void *arg);
+int __pthread_create_js(pthread_t thread, const pthread_attr_t *attr, void *(*start_routine) (void *), void *arg);
 int _emscripten_default_pthread_stack_size();
 void __set_thread_state(pthread_t ptr, int is_main, int is_runtime, int can_block);
 
diff --git a/test/pthread/main_thread_join.cpp b/test/pthread/main_thread_join.cpp
index afa611aaf7ad5..ece9c74d59920 100644
--- a/test/pthread/main_thread_join.cpp
+++ b/test/pthread/main_thread_join.cpp
@@ -33,7 +33,7 @@ void *ThreadMain(void *arg) {
   // succeeding.
   while (tries.load() < EXPECTED_TRIES) {}
 #endif
-	pthread_exit((void*)0);
+  pthread_exit((void*)0);
 }
 
 pthread_t CreateThread() {