/* Initializes the process subsystem (if it is not already initialized). Calls
* exit() if initialization fails.
*
+ * This function may not be called after creating any additional threads.
+ *
* Calling this function is optional; it will be called automatically by
* process_start() if necessary. Calling it explicitly allows the client to
* prevent the process from exiting at an unexpected time. */
* argv[0] is used as the name of the process. Searches the PATH environment
* variable to find the program to execute.
*
+ * This function may not be called after creating any additional threads.
+ *
* All file descriptors are closed before executing the subprocess, except for
* fds 0, 1, and 2.
*
#include <sys/types.h>
struct process;
+
+/* Starting and monitoring subprocesses.
+ *
+ * process_init() and process_start() may safely be called only from a
+ * single-threaded parent process. The parent process may safely create
+ * additional threads afterward, as long as the remaining functions in this
+ * group are called only from a single thread at any given time. */
void process_init(void);
-char *process_escape_args(char **argv);
int process_start(char **argv, struct process **);
void process_destroy(struct process *);
int process_kill(const struct process *, int signr);
-
pid_t process_pid(const struct process *);
const char *process_name(const struct process *);
bool process_exited(struct process *);
int process_status(const struct process *);
-char *process_status_msg(int);
-
void process_run(void);
void process_wait(struct process *);
+/* These functions are thread-safe. */
+char *process_status_msg(int);
+char *process_escape_args(char **argv);
char *process_search_path(const char *);
#endif /* process.h */