[PATCH v2 00/10] Reduce #ifdef NO_PTHREADS

The send-pack.c patch is dropped since it's tied to async code and like transport-helper.c (or more cleanups in index-pack.c) could be left for later.

I added one more patch to shut up -Wmaybe-uninitialized but since I could not reproduce it, Jeff would need to verify if it works for him.

Nguyễn Thái Ngọc Duy (10):
  thread-utils: macros to unconditionally compile pthreads API
  index-pack: remove #ifdef NO_PTHREADS
  name-hash.c: remove #ifdef NO_PTHREADS
  attr.c: remove #ifdef NO_PTHREADS
  grep: remove #ifdef NO_PTHREADS
  preload-index.c: remove #ifdef NO_PTHREADS
  pack-objects: remove #ifdef NO_PTHREADS
  read-cache.c: remove #ifdef NO_PTHREADS
  Clean up pthread_create() error handling
  read-cache.c: initialize copy_len to shut up gcc 8

 Makefile               |  2 +-
 attr.c                 | 14 ---------
 builtin/grep.c         | 59 ++++++++++++++----------------------
 builtin/index-pack.c   | 68 +++++++++++-------------------------------
 builtin/pack-objects.c | 26 ++--------------
 grep.c                 |  6 ----
 grep.h                 |  6 ----
 name-hash.c            | 38 +++++++++--------------
 pack-objects.h         |  6 ----
 preload-index.c        | 23 +++++---------
 read-cache.c           | 53 ++++++++++++--------------------
 run-command.c          |  2 +-
 thread-utils.c         | 48 +++++++++++++++++++++++++++++
 thread-utils.h         | 48 +++++++++++++++++++++++++++--
 14 files changed, 178 insertions(+), 221 deletions(-)

Range-diff against v1:
 1:  fd4926a83a !  1:  2791c06629 thread-utils: macros to unconditionally compile pthreads API
    @@ -146,6 +146,7 @@
     +#define pthread_t int
     +#define pthread_mutex_t int
     +#define pthread_cond_t int
    ++#define pthread_key_t int
     +
     +#define pthread_mutex_init(mutex, attr) dummy_pthread_init(mutex)
     +#define pthread_mutex_lock(mutex)
 2:  47b1f63fdd =  2:  61b3efceee index-pack: remove #ifdef NO_PTHREADS
 3:  a842b27e1e =  3:  93aa33eaa6 name-hash.c: remove #ifdef NO_PTHREADS
 4:  c0939283c3 =  4:  5d9441d8e2 attr.c: remove #ifdef NO_PTHREADS
 5:  6c6f3a0d28 <  -:  ---------- send-pack.c: remove #ifdef NO_PTHREADS
 6:  9f6e259fb4 !  5:  834b19d5c6 grep: remove #ifdef NO_PTHREADS
    @@ -13,6 +13,16 @@
      static pthread_t *threads;
      
      /* We use one producer thread and THREADS consumer
    +@@
    + 	int hit = 0;
    + 	int i;
    + 
    ++	if (!HAVE_THREADS)
    ++		return 0;
    ++
    + 	grep_lock();
    + 	all_work_added = 1;
    + 
     @@
      
      	return hit;
    @@ -136,15 +146,6 @@
      
      	if (show_in_pager && (cached || list.nr))
      		die(_("--open-files-in-pager only works on the worktree"));
    -@@
    - 		hit = grep_objects(&opt, &pathspec, &list);
    - 	}
    - 
    --	if (num_threads)
    -+	if (HAVE_THREADS && num_threads)
    - 		hit |= wait_all();
    - 	if (hit && show_in_pager)
    - 		run_pager(&opt, prefix);
     
      diff --git a/grep.c b/grep.c
      --- a/grep.c
 7:  97fb2fdba4 =  6:  10969f86ae preload-index.c: remove #ifdef NO_PTHREADS
 8:  b8aeb2776b =  7:  7e83190364 pack-objects: remove #ifdef NO_PTHREADS
 9:  40a9bfb8f2 =  8:  404e9d9041 read-cache.c: remove #ifdef NO_PTHREADS
10:  0bb0c667ff =  9:  046008b4ef Clean up pthread_create() error handling
 -:  ---------- > 10:  2ad9554687 read-cache.c: initialize copy_len to shut up gcc 8