From a4cb6bcdba6c36140b145fd5c9a024f318776722 Mon Sep 17 00:00:00 2001
From: Alessandre Laguierce <alessandre.laguierce@enseirb-matmeca.fr>
Date: Sun, 23 Mar 2025 20:19:23 +0100
Subject: [PATCH] feat: use a single allocation per entry

---
 src/thread/thread.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/src/thread/thread.c b/src/thread/thread.c
index e678e05..b378468 100644
--- a/src/thread/thread.c
+++ b/src/thread/thread.c
@@ -38,6 +38,7 @@ struct context_entry {
     void *waiting;
     void* retvalue;
     int valgrind_id;
+    char stack[STACK_SIZE];
     char status;
 };
 
@@ -106,7 +107,7 @@ int thread_create(thread_t* newthread, void* (*func)(void*), void* funcarg)
 
     getcontext(&new_entry->context);
 
-    new_entry->context.uc_stack.ss_sp = malloc(STACK_SIZE);
+    new_entry->context.uc_stack.ss_sp = new_entry->stack;
     new_entry->context.uc_stack.ss_size = STACK_SIZE;
     new_entry->context.uc_stack.ss_flags = 0;
 
@@ -167,7 +168,6 @@ int thread_join(thread_t thread, void** retval)
     TRACE("DEBUG %p,%d", entry, WAS_ALLOCATED(entry));
     if (WAS_ALLOCATED(entry)) {
         VALGRIND_STACK_DEREGISTER(entry->valgrind_id);
-        free(entry->context.uc_stack.ss_sp);
     }
     free(entry);
 
@@ -205,7 +205,6 @@ void clear_context(void)
         last = TAILQ_FIRST(&head);
         TAILQ_REMOVE(&head, last, link);
         if (WAS_ALLOCATED(last)) {
-            free(last->context.uc_stack.ss_sp);
             VALGRIND_STACK_DEREGISTER(last->valgrind_id);
         }
         if (IS_WAITED(last)) {