Add struct mg_queue and API, change examples/multi-threaded, add tests

examples/multi-threaded/Makefile

@@ -1,17 +1,26 @@
-PROG ?= example
-ROOT ?= $(realpath $(CURDIR)/../..)
-CWD ?= $(realpath $(CURDIR))
-DOCKER ?= docker run --rm -it -e Tmp=. -e WINEDEBUG=-all -v $(ROOT):$(ROOT) -w $(CWD)
+SOURCES = main.c mongoose.c       # Source code files
+CFLAGS = -W -Wall -Wextra -g -I.  # Build options
+
+# Mongoose build options. See https://mongoose.ws/documentation/#build-options
+CFLAGS_MONGOOSE += -DMG_ENABLE_ATOMIC=1
+
+ifeq ($(OS),Windows_NT)
+  # Windows settings. Assume MinGW compiler. To use VC: make CC=cl CFLAGS=/MD
+  PROG ?= example.exe           # Use .exe suffix for the binary
+  CC = gcc                      # Use MinGW gcc compiler
+  CFLAGS += -lws2_32            # Link against Winsock library
+  DELETE = cmd /C del /f /q /s  # Command prompt command to delete files
+else
+  # Mac, Linux
+  PROG ?= example
+  DELETE = rm -rf
+endif
 
 all: $(PROG)
-	$(RUN) ./$(PROG)
+	$(RUN) ./$(PROG) $(ARGS)
 
-$(PROG):
-	$(CC) ../../mongoose.c -I../.. -pthread $(CFLAGS) -o $(PROG) main.c
-
-$(PROG).exe:
-	$(DOCKER) mdashnet/vc98 wine cl ../../mongoose.c main.c -I../.. /MD ws2_32.lib /Fe$@
-	$(DOCKER) mdashnet/vc98 wine $@
+$(PROG): $(SOURCES)
+	$(CC) $(SOURCES) $(CFLAGS) $(CFLAGS_MONGOOSE) $(CFLAGS_EXTRA) -o $@
 
 clean:
-	rm -rf $(PROG) *.o *.dSYM *.gcov *.gcno *.gcda *.obj *.exe *.ilk *.pdb log.txt
+	$(DELETE) $(PROG) *.o *.obj *.exe *.dSYM