Subject: [PATCH v4] compat/winansi: check for errors of CreateThread() correctly

From: "Rose via GitGitGadget" <[email-masked]>
Date: Wed, 01 Feb 2023 22:20:33 +0000

From: Seija Kijin <[email-masked]>

The return value for failed thread creation is NULL,
not INVALID_HANDLE_VALUE, unlike other Windows API functions.

Signed-off-by: Seija Kijin <[email-masked]>
---
    win32: check for NULL after creating thread
    
    Check for NULL handles, not "INVALID_HANDLE," as CreateThread guarantees
    a valid handle in most cases.
    
    The return value for failed thread creation is NULL, not
    INVALID_HANDLE_VALUE, unlike other Windows API functions.
    
    Signed-off-by: Seija Kijin [email-masked]

Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-git-1445%2FAtariDreams%2FhThread-v4
Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-git-1445/AtariDreams/hThread-v4
Pull-Request: https://github.com/git/git/pull/1445

Range-diff vs v3:

 1:  1cbc43e0d82 ! 1:  6c4188977e8 win32: check for NULL after creating thread
     @@ Metadata
      Author: Seija Kijin <[email-masked]>
      
       ## Commit message ##
     -    win32: check for NULL after creating thread
     -
     -    Check for NULL handles, not "INVALID_HANDLE,"
     -    as CreateThread guarantees a valid handle in most cases.
     +    compat/winansi: check for errors of CreateThread() correctly
      
          The return value for failed thread creation is NULL,
          not INVALID_HANDLE_VALUE, unlike other Windows API functions.

 compat/winansi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/compat/winansi.c b/compat/winansi.c
index 3abe8dd5a27..f83610f684d 100644
--- a/compat/winansi.c
+++ b/compat/winansi.c
@@ -644,7 +644,7 @@ void winansi_init(void)
 
 	/* start console spool thread on the pipe's read end */
 	hthread = CreateThread(NULL, 0, console_thread, NULL, 0, NULL);
-	if (hthread == INVALID_HANDLE_VALUE)
+	if (!hthread)
 		die_lasterr("CreateThread(console_thread) failed");
 
 	/* schedule cleanup routine */

base-commit: 2fc9e9ca3c7505bc60069f11e7ef09b1aeeee473
-- 
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