Add comment about the use of EXEC_BACKEND.

diff --git a/src/backend/postmaster/postmaster.c b/src/backend/postmaster/postmaster.c
index 8a67ec550b85b2d63fe57e502f12b8cacea925d4..aaaab64a867425a15cbba7efe3445a22f8be83bc 100644 (file)
--- a/src/backend/postmaster/postmaster.c
+++ b/src/backend/postmaster/postmaster.c
@@ -3286,6 +3286,10 @@ postmaster_forkexec(int argc, char *argv[])
 /*
  * backend_forkexec -- fork/exec off a backend process
  *
+ * Some operating systems (WIN32) don't have fork() so we have to simulate
+ * it by storing parameters that need to be passed to the child and
+ * then create a new child process.
+ *
  * returns the pid of the fork/exec'd process, or -1 on failure
  */
 static pid_t