Fix spelling errors

aligment -> alignment
purgable -> purgeable
thead -> thread

include/mimalloc-types.h

@@ -96,7 +96,7 @@ terms of the MIT license. A copy of the license can be found in the file
 // Maximum number of size classes. (spaced exponentially in 16.7% increments)
 #define MI_BIN_HUGE  (64U)
 
-// Minimal aligment necessary. On most platforms 16 bytes are needed
+// Minimal alignment necessary. On most platforms 16 bytes are needed
 // due to SSE registers for example. This must be at least `MI_INTPTR_SIZE`
 #define MI_MAX_ALIGN_SIZE  16   // sizeof(max_align_t)
 
@@ -150,7 +150,7 @@ typedef union mi_thread_free_u {
 // `thread_free` for freed blocks by other threads
 // The `local_free` and `thread_free` lists are migrated to the `free` list
 // when it is exhausted. The separate `local_free` list is necessary to
-// implement a monotonic heartbeat. The `thead_free` list is needed for
+// implement a monotonic heartbeat. The `thread_free` list is needed for
 // avoiding atomic operations in the common case.
 //
 // `used - thread_freed` == actual blocks that are in use (alive)

src/alloc-override-osx.c

@@ -201,7 +201,7 @@ static void __attribute__((constructor)) _mi_macosx_override_malloc()
   zone.pressure_relief = &zone_pressure_relief;
   intro.zone_locked = &intro_zone_locked;
 
-  // force the purgable zone to exist to avoid strange bugs
+  // force the purgeable zone to exist to avoid strange bugs
   if (malloc_default_purgeable_zone) {
     purgeable_zone = malloc_default_purgeable_zone();
   }

src/alloc-override-win.c

@@ -34,7 +34,7 @@ by us is freed after we unpatched.
 
 There are two tricky situations to deal with:
 
-1. The Thread Local Storage (TLS): when the main thead stops it will call registered
+1. The Thread Local Storage (TLS): when the main thread stops it will call registered
    callbacks on TLS entries (allocated by `FlsAlloc`). This is done by the OS
    before any DLL's are unloaded. Unfortunately, the C runtime registers such
    TLS entries with CRT allocated memory which is freed in the callback.

src/page-queue.c

@@ -18,13 +18,13 @@ terms of the MIT license. A copy of the license can be found in the file
 ----------------------------------------------------------- */
 
 #if (MI_MAX_ALIGN_SIZE > 4*MI_INTPTR_SIZE)
-  #error "define aligment for more than 4x word size for this platform"
+  #error "define alignment for more than 4x word size for this platform"
 #elif (MI_MAX_ALIGN_SIZE > 2*MI_INTPTR_SIZE)
   #define MI_ALIGN4W   // 4 machine words minimal alignment
 #elif (MI_MAX_ALIGN_SIZE > MI_INTPTR_SIZE)
   #define MI_ALIGN2W   // 2 machine words minimal alignment
 #else
-  // ok, default aligment is 1 word
+  // ok, default alignment is 1 word
 #endif